feat: add foundry skill user agent in azd ai agent

[anchenyi]

Summary

Adds a Foundry Skill User-Agent to requests sent by the azure.ai.agents extension to Microsoft Foundry services.

When AZURE_DEV_USER_AGENT contains microsoft_foundry_skill, existing Foundry service request User-Agent values append microsoft-foundry-skill/1.0.

This enables Foundry service-side attribution.

Validation

• Added unit tests for User-Agent construction
• Verified the environment value is not forwarded
• Ran affected Go tests
• Ran go build ./...

Fixes: #9727

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[Copilot]

Pull request overview

Centralizes Azure AI Agents extension User-Agent construction and adds Foundry skill attribution when invoked with the designated environment marker.

Changes:

• Adds shared User-Agent helpers and tests.
• Applies Foundry skill attribution across API, ARM, connection, streaming, and doctor requests.
• Preserves existing client-specific User-Agent values.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
internal/pkg/useragent/user_agent.go	Defines shared User-Agent generation.
internal/pkg/useragent/user_agent_test.go	Tests skill attribution behavior.
internal/pkg/azure/foundry_toolsets_client.go	Uses the shared default User-Agent.
internal/pkg/azure/foundry_projects_client.go	Uses the shared default User-Agent.
internal/pkg/azure/foundry_memory_store_client.go	Uses the shared default User-Agent.
internal/pkg/azure/client_options.go	Applies the shared User-Agent to ARM clients.
internal/pkg/agents/optimize_api/client.go	Tags optimization requests.
internal/pkg/agents/eval_api/operations.go	Tags evaluation requests.
internal/pkg/agents/dataset_api/operations.go	Tags dataset requests.
internal/pkg/agents/agent_api/operations.go	Tags agent and log-stream requests.
internal/connections/pkg/connections/data_client.go	Tags connection requests.
internal/cmd/doctor/checks_foundry_endpoint.go	Tags doctor probe requests.

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[github-actions]

📋 Prioritization Note

Thanks for the contribution! The linked issue isn't in the current milestone yet.
Thank you for logging this issue; our team is reviewing it. If you need urgent prioritization, tag Rick Winter (@RickWinter) and Kristen Womack (@kristenwomack) to let us know.

[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated no new comments.

[Travis Angevine (trangevi)]

What about the other extensions?

[anchenyi]

What about the other extensions?

Travis Angevine (@trangevi) right now, we just need to analyze hosted agent BI data, so azure.ai.agent extension is enough.