Live test update & issue fix

[vidai-msft]

Description

This PR accomplishes the followings.

• Windows-2019 agent has been deprecated. Remove all windows-2019 jobs and replace windows-2022 jobs with windows-latest.
• Fix the MacOS hang issue when running live test.

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

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[Copilot]

Pull Request Overview

This PR removes deprecated Windows-2019 jobs and updates the live test pipelines to use newer platforms while introducing a new script to clean up Azure Identity Keys on MacOS to address a hanging issue.

• Replaces Windows-2019 jobs with windows-latest in pipeline definitions
• Updates job names and target operating systems (including shifts to Linux and MacOS for some tasks)
• Introduces a Bash script to clean MacOS keychain entries

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tools/TestFx/Live/CleanAzureIdentityKeysForMacOS	New Bash script added for cleaning keychain entries on MacOS
.azure-pipelines/util/live-test-steps.yml	Added a new Bash task to invoke the cleanup script on MacOS
.azure-pipelines/live-test.yml	Updated pipeline definitions: replacing deprecated Windows agents and renaming jobs; some jobs now target Linux and MacOS

Comments suppressed due to low confidence (3)

.azure-pipelines/live-test.yml:78

• The job 'ps_7_4_x_linux' now targets a Linux agent instead of Windows; please confirm that this change in platform is intentional.

      name: 'ps_7_4_x_linux'

.azure-pipelines/live-test.yml:88

• The job 'ps_7_5_x_linux' has been shifted from Windows to Linux; please verify if this platform change aligns with the intended live test environment.

      name: 'ps_7_5_x_linux'

.azure-pipelines/live-test.yml:98

• The job 'ps_latest_linux' now runs on a Linux agent instead of the previous Windows configuration; please double-check that this alteration is expected.

      name: 'ps_latest_linux'

[Copilot]

[nitpick] There are multiple commented-out pipeline template invocations; consider removing these unused code blocks to improve maintainability.