Update the build release workflow

[mitchelbaker-cisa]

🗣 Description

The build_release workflow was written to target branch names with the format release-<version number>. Since we don't use release branches the workflow was failing. This PR addresses this problem by removing one of the GitHub Actions to generate release notes, and instead uses the gh-action-release action to generate release notes.

🧪 Testing

Generated a draft release with the new updates:

✅ Pre-approval checklist

• Changes are limited to a single goal AND
  the title reflects this in a clear human readable format
• Issue that this PR solves has been selected in the Development section
• I have read and agree to LME's CONTRIBUTING.md document.
• The PR adheres to LME's requirements in RELEASES.md
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated to reflect the changes in this PR.

✅ Pre-merge Checklist

• All tests pass
• PR has been tested and the documentation for testing is above
• Squash and merge all commits into one PR level commit

✅ Post-merge Checklist

• Delete the branch to keep down number of branches

[mreeve-snl]

LGTM :)