Update release workflow checkbox and tag refresh handling

[Copilot]

• Inspect the release workflow and related GitHub Actions setup
• Run existing validation commands to capture the current baseline (dotnet format --verify-no-changes --no-restore fails on existing line-ending issues; dotnet build -c Release passes; dotnet test -c Release --no-build currently fails with a VSTestTask error)
• Update the release and deploy workflow dispatch input so update existing release is a checkbox
• Make release updates move an existing tag to the workflow run commit before updating the release
• Re-run relevant validation for the workflow change
• Run PR validation and create the pull request

[danielchalmers]

This is a more complex than I was hoping for