Allow specifying priority when creating a single set of jobs

[Martchus]

Also see the individual commit messages for further improvements and https://progress.opensuse.org/issues/162029

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.50%. Comparing base (e1f26e3) to head (6fc4e62).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5834 +/- ## ======================================= Coverage 98.50% 98.50% ======================================= Files 395 395 Lines 38713 38732 +19 ======================================= + Hits 38134 38153 +19 Misses 579 579 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.