[PS] migrate MachineLearningServices module to autorest v4

[JoyerJin]

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

[azure-client-tools-bot-prd]

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[Copilot]

Pull Request Overview

This pull request migrates the MachineLearningServices module to AutoRest v4, which involves regenerating documentation and updating API references across numerous cmdlet help files. The changes primarily reflect the AutoRest v4 code generation updates, including parameter type changes from strongly-typed enums to strings and modifications to cmdlet examples and output formatting.

Key Changes:

• Updated all cmdlet documentation files to reflect AutoRest v4 API schema changes
• Converted strongly-typed enum parameters to string types across all cmdlets
• Added new parameter sets and parameters for improved cmdlet flexibility (e.g., WorkspaceInputObject, JsonFilePath, JsonString)

Reviewed Changes

Copilot reviewed 199 out of 452 changed files in this pull request and generated no comments.

File	Description
All Update-*.md files	Updated parameter types from enums to strings, removed "To construct" notes, added new parameter sets
All New-*.md files	Updated parameter types, added identity-based and JSON-based parameter sets, improved examples
All Remove-*.md files	Added new identity-based parameter sets for improved pipeline support
All Start/Stop/Restart-*.md files	Added workspace identity parameter sets for better workflow integration