fix(archive-on-stop): add missing @Transactional annotation on StopRecordingJob

[aali309]

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Fixes: #453

Description of the change:

This change allows an environment variable to be configured so that...

Motivation for the change:

see https://github.com/cryostatio/cryostat3/issues/453

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... bash smoketest.bash...
2. Go to Recordings
3. Create a 10 second recording with Archive on Stop option selected and wait for 10 seconds
4. See notification appears and table updated (recording is now in STOPPED state)
5. Go to Recordings > Archived Recordings, the archived recording should be available

[aali309]

/build_test

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CI build and push: All tests pass ✅ (JDK17) https://github.com/cryostatio/cryostat3/actions/runs/9035109072