• Check GH token availbility for Get-Changelog

PR Summary

This pull request includes changes to thetools/releaseTools.psm1 file to improve the handling of GitHub authentication tokens in theGet-ChangeLog function. The most important changes include making theToken parameter optional and adding a new function to check for an authentication token.

Improvements to GitHub token handling:

• Modified theToken parameter inGet-ChangeLog to be optional instead of mandatory.
• Added a newCheckForAuthToken function that checks for an existing GitHub CLI token or prompts the user to enter one if not found.
• UpdatedGet-ChangeLog to callCheckForAuthToken if theToken parameter is not provided, ensuring a token is available for GitHub API requests.

PR Context

PR Checklist

• PR has a meaningful title
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• Summarized changes
• Make sure all.h,.cpp,.cs,.ps1 and.psm1 files have the correct copyright header
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  • Experimental feature(s) needed
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• User-facing changes
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  • Documentation needed
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• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
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