Live test pipline support all the tests in azure-cli-extensions repo

[zhoxing-ms]

Is your feature request related to a problem? Please describe.

When CLI is in bumping version, if there are some breaking changes may affect extensions ( such as: Azure/azure-cli-extensions#2129 ) , we need a test system to test all extension tests in azure-cli-extensions repo.

Describe the solution you'd like

• Supports manual trigger to run all tests in azure-cli-extensions repo
• We can select branch of azure-cli repo that is dependent, because the upgrade of CLI has not been released during the test.

Describe alternatives you've considered

Additional context

[yonzhan]

Live test pipline enhancement

[qwordy]

Feature request received

[qwordy]

Finished. Please read user manual carefully.