[SSH] Update ssh.helper generated code

[lijinpei2008]

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
  • For SDK-based development mode, 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.
  • For autorest-based development mode, include the changelog in the PR description.
  • 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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[VeryEarly]

this PR is similar to #27170, why is changelog needed here?

[lijinpei2008]

this PR is similar to #27170, why is changelog needed here?

The original Ssh.Helper code was generated via autorest CSharp, now the commit to code is generated via autorest powershell. Although the functionality provided is the same, the tools used to generate it are different, so it is important to differentiate between the versions, thus updating the changelog.md file.

[lijinpei2008]

this PR is similar to #27170, why is changelog needed here?

The original Ssh.Helper code was generated via autorest CSharp, now the commit to code is generated via autorest powershell. Although the functionality provided is the same, the tools used to generate it are different, so it is important to differentiate between the versions, thus updating the changelog.md file.

what are different from #27170 ?

In the PS Gallery, the current version of Az.SSH is 0.2.2, and the code for Ssh.Helper called by commands in this version is generated by the tool autorest.CSharp.
The code I am submitting for Ssh.Helper is generated by the tool autorest.powershell.
When that code is merged and released, the Az.SSH version number released to the public may be 0.2.3 or 0.3.0, but in any case the version number has changed, so I need to submit a ChangLog note.

Since the difference between the old and new versions is that the code generation tool for Ssh.Helper has changed, a description has been added to the ChangeLog.md file: * Migrated Ssh.Helper generation from autorest csharp to autorest powershell.

In #27170, the module I'm working with is Az.Websites, in the current PR the module I'm working with is Az.SSH.

[lijinpei2008]

The changelog is described as: * Implemented code refactoring, no behavior changes expected.