[PS] Migrate AutoScale in Monitor 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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[github-actions]

To the author of the pull request,
This PR was labeled "Breaking Change Release" because it contains breaking changes.

• According to our policy, breaking changes can only take place during major release and they must be preannounced.
• Please follow our guide on the detailed steps.
• Required: Please fill in the task below to facilitate our contact,you will receive notifications related to breaking changes.

[Copilot]

Pull Request Overview

This pull request migrates the AutoScale module in Monitor to autorest v4, bringing breaking changes to maintain consistency with the new autorest version. The migration involves updating API generation patterns, parameter types, and documentation formats.

• Migration from autorest v3 to v4 with breaking changes to property types and parameter signatures
• Updated parameter types from specific enum types to string types for better flexibility
• Removed deprecated administrator notification parameters due to Azure classic administrator retirement

Reviewed Changes

Copilot reviewed 36 out of 36 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/StaticAnalysis/Exceptions/Az.Monitor/BreakingChangeIssues.csv	Adds breaking change exceptions for type changes from enums to strings and arrays to lists
src/Monitor/Monitor/help/*.md	Updates help documentation to reflect new parameter types and remove API version references
src/Monitor/Monitor/ChangeLog.md	Documents retirement of classic administrator notification parameters
src/Monitor/Monitor.sln	Reorders project references in solution file
src/Monitor/Autoscale.Autorest/test/*	Updates test files with new environment configuration and removes deprecated parameters
src/Monitor/Autoscale.Autorest/docs/*.md	Updates documentation to reflect new parameter types and URLs
src/Monitor/Autoscale.Autorest/custom/*.ps1	Updates custom cmdlet implementations with new type signatures
src/Monitor/Autoscale.Autorest/README.md	Simplifies autorest configuration and removes breaking change directives