Fix Live Test Errors

[YanaXu]

Description

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
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  • 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

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[Copilot]

Pull request overview

This PR updates AutoRest live test scenario scripts to address failing live runs by aligning test inputs with current cmdlet parameters/expected outputs and refreshing container image selections.

Changes:

• Functions live test: update Function App identity enablement to use -EnableSystemAssignedIdentity $true.
• ContainerInstance live tests: refresh container image tags and explicitly set container resource requests (CPU/memory).
• ContainerInstance live test: fix tag count assertion order/value access (1 vs $actual.Tag.Count).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Functions/LiveTests/Functions.Autorest/TestLiveScenarios.ps1	Updates the Function App live update scenario to enable system-assigned identity using the current parameter.
src/ContainerInstance/LiveTests/ContainerInstance.Autorest/TestLiveScenarios.ps1	Updates container images, sets CPU/memory requests for container instances, and corrects tag count assertion.