Open Id Issuer validation Reporting, Fixes AB#3268088

[mohitc1]

Fixes AB#3268088

This PR implements OpenID issuer validation in the OpenIdProviderConfigurationClient to detect and report cases where the issuer returned in the metadata document doesn't match the expected authority. The validation is gated behind a feature flag and includes telemetry reporting for different validation failure scenarios.

Key changes:

• Added issuer validation logic with telemetry reporting for OpenID configuration mismatches
• Introduced new OpenTelemetry attributes and metrics for tracking validation failures
• Added utility methods for Azure Active Directory cloud validation

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[Copilot]

Pull Request Overview

This PR implements OpenID issuer validation in the OpenIdProviderConfigurationClient to detect and report cases where the issuer returned in the metadata document doesn't match the expected authority. The validation is gated behind a feature flag and includes telemetry reporting for different validation failure scenarios.

Key changes:

• Added issuer validation logic with telemetry reporting for OpenID configuration mismatches
• Introduced new OpenTelemetry attributes and metrics for tracking validation failures
• Added utility methods for Azure Active Directory cloud validation

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
OpenIdProviderConfigurationClient.java	Main implementation of issuer validation with telemetry reporting
AzureActiveDirectoryCloud.java	Made isValidated() method public for validation checks
AzureActiveDirectory.java	Added utility methods for cloud discovery and public cloud validation
AttributeName.java	Added new OpenTelemetry attribute names for issuer validation
CommonFlight.java	Added feature flag to control issuer validation reporting
changelog.txt	Updated changelog with PR description

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