When a repository is deleted while one of its Actions runs still has a
pending job update in the emitter queue, `checkJobsByRunID` returns an
error because the run no longer exists. The queue handler in
`jobEmitterQueueHandler` treats every error as unhandled and requeues
the item, creating an infinite retry loop that fills the log with error
messages.
### Changes
1. **`services/actions/job_emitter.go`** — swap the `!exist`/`err` check
order so a database error is reported first, then treat a non-existent
run as handled (nil error). The queue consumer drops the item instead of
requeueing it.
2. **`services/actions/job_emitter_test.go`** — add
`Test_checkJobsByRunID_DeletedRunIsHandled`, which verifies that a
deleted run produces nil (handled, not requeued).
### Related issue
Fixes#39034
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Co-authored-by: bircni <bircni@icloud.com>
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