Refine NuGet package tagging

[nulltoken]

Pull request description

According to these docs (here and there), tags should be separated by semicolons, not commas (although that seems to work).

Beside aligning the syntax, this also slightly attempts to "optimize" the tagging.

PR meta checklist

• Pull request is targeted at main branch for code
• Pull request is linked to all related issues, if any.

Code PR specific checklist

• My code follows the code style of this project and AspNetCore coding guidelines.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have updated the appropriate sub section in the CHANGELOG.md.
• I have added, updated or removed tests to according to my changes.
  • All tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

see 1 file with indirect coverage changes