[Key Vault] Added API 2026-01-01-preview with EkmClient and EkmConnection

[ncamillucci]

Description

• Added support for service API version 2026-01-01-preview (Release 2026-01-01-preview branch to main azure-rest-api-specs#40761)
• Added KeyVaultEkmClient for managing Managed HSM External Key Manager (EKM) connections. This new client exposes get_ekm_connection, create_ekm_connection, update_ekm_connection, delete_ekm_connection, get_ekm_certificate, and check_ekm_connection.
• Added KeyVaultEkmConnection, KeyVaultEkmProxyClientCertificateInfo, and KeyVaultEkmProxyInfo models supporting the EKM client.
• Python 3.9 is no longer supported. Please use Python version 3.10 or later.
• Key Vault API version 2026-01-01-preview is now the default.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR updates azure-keyvault-administration to support the 2026-01-01-preview service API version and introduces a new KeyVaultEkmClient (+ models) for managing Managed HSM External Key Manager (EKM) connections, along with samples and tests.

Changes:

• Added sync/async KeyVaultEkmClient and EKM-related public models (KeyVaultEkmConnection, KeyVaultEkmProxyClientCertificateInfo, KeyVaultEkmProxyInfo).
• Regenerated/updated generated client, operations, and models to include EKM endpoints and make 2026-01-01-preview the default API version.
• Added EKM samples/tests and updated docs/metadata accordingly.

Reviewed changes

Copilot reviewed 38 out of 38 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
sdk/keyvault/cspell.json	Adds cspell ignore word for the new README anchor/client name.
sdk/keyvault/azure-keyvault-administration/tsp-location.yaml	Updates the pinned REST API specs commit for regeneration.
sdk/keyvault/azure-keyvault-administration/tests/test_ekm_client.py	Adds live EKM client test coverage (sync).
sdk/keyvault/azure-keyvault-administration/tests/test_ekm_client_async.py	Adds live EKM client test coverage (async).
sdk/keyvault/azure-keyvault-administration/tests/conftest.py	Adds sanitizers for EKM host and CA certificate env vars.
sdk/keyvault/azure-keyvault-administration/tests/_test_case.py	Adds sync EKM client test preparer and playback defaults.
sdk/keyvault/azure-keyvault-administration/tests/_async_test_case.py	Adds async EKM client test preparer and playback defaults.
sdk/keyvault/azure-keyvault-administration/setup.py	Updates package metadata/classifiers and Python version requirement.
sdk/keyvault/azure-keyvault-administration/samples/ekm_operations.py	Adds sync sample demonstrating EKM connection lifecycle.
sdk/keyvault/azure-keyvault-administration/samples/ekm_operations_async.py	Adds async sample demonstrating EKM connection lifecycle.
sdk/keyvault/azure-keyvault-administration/README.md	Documents KeyVaultEkmClient and links new samples.
sdk/keyvault/azure-keyvault-administration/CHANGELOG.md	Adds 4.8.0b1 unreleased notes for the new API/client/models and default API version.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/aio/_ekm_client.py	Adds async public EKM client wrapper over generated operations.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/aio/init.py	Exports KeyVaultEkmClient from the async namespace.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_version.py	Bumps package version to 4.8.0b1.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_models.py	Adds public EKM models and conversions to/from generated models.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_internal/http_challenge_cache.py	Removes an extraneous blank line (formatting cleanup).
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_internal/client_base.py	Adds 2026-01-01-preview ApiVersion and makes it the default.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/operations/_patch.py	Minor formatting update in generated patch file.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/operations/_operations.py	Regenerated operations to default to 2026-01-01-preview and add EKM endpoints (sync).
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/models/_patch.py	Minor formatting update in generated patch file.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/models/_models.py	Adds generated EKM models.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/models/init.py	Exposes generated EKM models at the generated models package level.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/aio/operations/_patch.py	Minor formatting update in generated patch file.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/aio/operations/_operations.py	Regenerated operations to default to 2026-01-01-preview and add EKM endpoints (async).
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/aio/_patch.py	Minor formatting update in generated patch file.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/aio/_configuration.py	Updates generated async configuration default API version/documentation.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/aio/_client.py	Updates generated async client typing import (Self) and API version docs.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/_utils/serialization.py	Updates Self import to use stdlib typing on Python 3.11+.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/_utils/model_base.py	Updates Self import and adjusts default-handling behavior in generated model base.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/_patch.py	Minor formatting update in generated patch file.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/_configuration.py	Updates generated sync configuration default API version/documentation.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_generated/_client.py	Updates generated sync client typing import (Self) and API version docs.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/_ekm_client.py	Adds sync public EKM client wrapper over generated operations.
sdk/keyvault/azure-keyvault-administration/azure/keyvault/administration/init.py	Exposes new EKM client/models in the public package API.
sdk/keyvault/azure-keyvault-administration/assets.json	Updates assets tag for test recordings/assets.
sdk/keyvault/azure-keyvault-administration/apiview-properties.json	Adds cross-language mappings for new EKM operations/models and updates cross-language version.
sdk/keyvault/azure-keyvault-administration/_metadata.json	Updates package metadata to reflect the new default API version.