New/Set-GitHubRepository: Add AllowAutoMerge and UseSquashPrTitleAsDefault Parameters

[X-Guardian]

Description

This PR adds the following parameters to the New-GitHubRepository and Set-GitHubRepository functions:

• AllowAutoMerge
• UseSquashPrTitleAsDefault

Issues Fixed

• Fixes #357

References

• https://docs.github.com/en/rest/repos/repos#create-an-organization-repository
• https://docs.github.com/en/rest/repos/repos#update-a-repository

Checklist

• [ ] You actually ran the code that you just wrote, especially if you did just "one last quick change".
• [ ] Comment-based help added/updated, including examples.
• [ ] Static analysis is reporting back clean.
• [ ] New/changed code adheres to our coding guidelines.
• [ ] Formatters were created for any new types being added.
• [ ] New/changed code continues to support the pipeline.
• [ ] Changes to the manifest file follow the manifest guidance.
• [ ] Unit tests were added/updated and are all passing. See testing guidelines. This includes making sure that all pipeline input variations have been covered.
• [ ] Relevant usage examples have been added/updated in USAGE.md.
• [ ] If desired, ensure your name is added to our Contributors list

[HowardWolosky]

/azp run PowerShellForGitHub-CI

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[HowardWolosky]

@X-Guardian -- you have this as a Draft. Anything else you were planning to do with it before wanting it merged in?

[X-Guardian]

@HowardWolosky , this PR is ready for merging.