[StackHCI] Add DoNotExportAttribute to internal functions

[JiaSeng-v]

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 updates the StackHCI module’s exported surface by marking additional helper functions as non-exportable, along with regenerated module artifacts/help content.

Changes:

• Add DoNotExportAttribute to additional internal helper functions in the StackHCI custom script to prevent unintended exports.
• Regenerate/update Register-AzStackHCI markdown help to include the -useStableAgentVersion switch.
• Update various generated metadata/artifacts (module manifest formatting/dependencies, solution/project GUID, generate-info id, assembly version).

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/StackHCI/StackHCI/help/Register-AzStackHCI.md	Adds documentation for -useStableAgentVersion in shipped help.
src/StackHCI/StackHCI/Az.StackHCI.psd1	Regenerated manifest metadata (date/dependency) and minor formatting/field presence changes.
src/StackHCI/StackHCI.sln	Updates the Az.StackHCI project GUID and associated solution mappings.
src/StackHCI/StackHCI.Autorest/generate-info.json	Updates generation identifier.
src/StackHCI/StackHCI.Autorest/docs/Register-AzStackHCI.md	Adds documentation for -useStableAgentVersion in AutoRest docs.
src/StackHCI/StackHCI.Autorest/docs/Az.StackHCI.md	Updates docs front-matter module GUID.
src/StackHCI/StackHCI.Autorest/custom/stackhci.ps1	Marks additional helper functions with DoNotExportAttribute.
src/StackHCI/StackHCI.Autorest/Properties/AssemblyInfo.cs	Updates assembly version to match module version.