(maint) Change GitLab settings to GitHub for teamcity

[AdmiringWorm]

Description Of Changes

This updates the tokens and providers used by teamcity to be the GitHub provider, instead of the GitLab provider.

Motivation and Context

To use the correct information to build on teamcity

Testing

N/A

Operating Systems Testing

N/A

Change Types Made

• [ ] Bug fix (non-breaking change).
• [ ] Feature / Enhancement (non-breaking change).
• [ ] Breaking change (fix or feature that could cause existing functionality to change).
• [ ] Documentation changes.
• [ ] PowerShell code changes.
• [x] Build Related

Change Checklist

• [ ] Requires a change to the documentation.
• [ ] Documentation has been updated.
• [ ] Tests to cover my changes, have been added.
• [ ] All new and existing tests passed?
• [ ] PowerShell code changes: PowerShell v2 compatibility checked?

Related Issue

N/A

[gep13]

@AdmiringWorm thank you!