AzureAuth GitHub release through ADO pipeline

[Haard30]

This PR adds the ADO pipeline that releases AzureAuth to GitHub.

This pipeline has similar behavior to original github release, except for a few things:

1. We no longer require SP secrets and instead use federated creds.
2. We use the 1ES Pipeline template. (We will switch to official pipeline template and mark the pipeline as prod in a follow-up PR). REVIEW the PR
3. Code signing - Our existing code signing mechanism of downloading the cert from Azure KV and storing it locally on windows cert store is no longer compatible with 1ES PT. So instead, we use the built-in ADO task (similar to how other teams perform code signing with ESRP). We should now be able to remove sign.py which leads to lesser code and dependencies to maintain (in a follow-up PR).

Here's the draft release created through this pipeline: https://github.com/AzureAD/microsoft-authentication-cli/releases/tag/untagged-c463728100f3301ee7c8

Testing:

1. Test end to end actual release of AureAuth using this pipeline.
2. Download, install and run AureAuth published through release.
3. Verify the code signing by looking at code signing summary generated through esrp task.
4. Reject/Approve the release and see behavior is correctly reflected.

[mijpeterson]

Just the one comment on pipeline variable casing consistency. No preference which way we go.