{CI} Update pipeline to use Python 3.14

[YangAn-microsoft]

Summary

Update CI to use Python 3.14 in the extensions pipeline.

Changes

• switch existing single-version pipeline jobs from Python 3.13 to Python 3.14
• add Python 3.14 to the SourceTests matrix

Validation

• CI only

[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @YangAn-microsoft,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[github-actions]

The git hooks are available for azure-cli and azure-cli-extensions repos. They could help you run required checks before creating the PR.

Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

pip install azdev --upgrade
azdev setup -c <your azure-cli repo path> -r <your azure-cli-extensions repo path>

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

• For more info about extension versioning, please refer to Extension version schema

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Updates the Azure Pipelines CI configuration to run against Python 3.14, expanding the test matrix and bumping several standalone jobs to the new Python version.

Changes:

• Added Python 3.14 to the SourceTests job matrix.
• Updated multiple UsePythonVersion@0 steps from Python 3.13 to 3.14.