Sync eng/common directory with azure-sdk-tools for PR 16705

[azure-sdk-automation]

Sync eng/common directory with azure-sdk-tools for PR Azure/azure-sdk-tools#16705 See eng/common workflow

[azure-pipelines]

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[Copilot]

Pull request overview

Note

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Refactors Azure DevOps pipeline steps to replace inline PowerShell with reusable scripts for test-proxy setup/startup checks and for staging test results into “llm-artifacts”.

Changes:

• Replace inline PowerShell in test-proxy pipeline template with PowerShell@2 tasks that call shared scripts.
• Add new PowerShell scripts to install/start/test the test-proxy and to stage test result files for LLM artifact upload.
• Update the llm-artifacts upload template (and a PR diff step) to use script files instead of inline PowerShell.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
eng/common/testproxy/test-proxy-tool.yml	Switches inline steps to PowerShell@2 tasks invoking shared test-proxy scripts
eng/common/scripts/Test-TestProxyIsAlive.ps1	New script to poll /Admin/IsAlive with retries
eng/common/scripts/Start-TestProxy.ps1	New script to start test-proxy on Windows and set PROXY_PID
eng/common/scripts/Install-TestProxy.ps1	New script to install test-proxy as a dotnet tool, prepend PATH, and set run-proxy variables
eng/common/scripts/Copy-TestResultsToLlmStaging.ps1	New script to stage test results into llm-artifacts and set an upload variable
eng/common/pipelines/templates/steps/upload-llm-artifacts.yml	Replaces inline staging logic with Copy-TestResultsToLlmStaging.ps1
eng/common/pipelines/templates/steps/save-package-properties.yml	Uses filePath execution for Generate-PR-Diff.ps1 instead of inline script

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