Fix blueprint_id attribute key to microsoft.a365.agent.blueprint.id

[singankit]

Update _ATTR_GEN_AI_AGENT_BLUEPRINT_ID from gen_ai.agent.blueprint.id to microsoft.a365.agent.blueprint.id and add corresponding test.

Description

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• The pull request does not introduce [breaking changes]
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[Copilot]

Pull request overview

This pull request corrects the OpenTelemetry attribute key used to emit an agent’s agent_blueprint_id in azure-ai-agentserver-core, and adds a regression test to ensure the correct key is exported on spans.

Changes:

• Update _ATTR_GEN_AI_AGENT_BLUEPRINT_ID to use microsoft.a365.agent.blueprint.id instead of gen_ai.agent.blueprint.id.
• Add an end-to-end tracing test verifying agent_blueprint_id is exported under the corrected attribute key.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
sdk/agentserver/azure-ai-agentserver-core/azure/ai/agentserver/core/_tracing.py	Updates the constant used by _FoundryEnrichmentSpanProcessor when stamping agent_blueprint_id onto span attributes.
sdk/agentserver/azure-ai-agentserver-core/tests/test_tracing.py	Adds a regression test that asserts the exported span includes microsoft.a365.agent.blueprint.id with the expected value.