Add batch generation parameter

[Pan-Qi]

Add some parameters for batch generation pipeline to improve dynamically control for certain test senarios.

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
  • 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

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[Copilot]

Pull Request Overview

This PR introduces new parameters to the batch generation pipeline for finer control over which modules are processed, how branches are handled, and who receives failure notifications.

• Added five parameters (TestChangedModulesOnly, SelectedTargetModules, NotificationReceiversOverride, GenerationBaseBranch, PrepareModulesOnGenerationBranch) to the pipeline YAML.
• Updated pipeline steps to display and wire those parameters into scripts and tasks.
• Enhanced PowerShell helper scripts (util.psm1, notify-failed-job.ps1, filter.ps1) to respect the new parameters.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
.azure-pipelines/batch-generation.yml	Added parameters, showVariables task, and wired them into tasks
.azure-pipelines/PipelineSteps/BatchGeneration/util.psm1	Filter modules by SELECTED_TARGET_MODULES
.azure-pipelines/PipelineSteps/BatchGeneration/notify-failed-job.ps1	Allow override of notification receivers via env var
.azure-pipelines/PipelineSteps/BatchGeneration/filter.ps1	Use TEST_CHANGED_MODULES_ONLY env var to conditionally run tests

Comments suppressed due to low confidence (1)

.azure-pipelines/batch-generation.yml:2

• The displayName line is prefixed with a hyphen, which will be parsed as a new parameter rather than an attribute of TestChangedModulesOnly. Remove the extra - so it reads displayName: ... under the same parameter block.

- name: TestChangedModulesOnly