Refine `SteveJobs` logic to distinguish between upstream and downstream Forgejo events

[betulependule]

This is a follow-up to #3154, which added support for handling of downstream Forgejo events by SteveJobs. All Forgejo events are currently assumed to be dist-git related. In order to add support for upstream Forgejo events, make sure SteveJobs differentiates between upstream and downstream events.

Relevant line of code:

packit-service/packit_service/worker/jobs.py

Lines 969 to 973 in cc8356c

	# [XXX] this assumes all Forgejo events come from dist-git
	# once we add support for Forgejo in the upstream, all forgejo.pr.Comment
	# events would be processed in this if branch meant only for dist-git,
	# so the decision logic will need to be refined
	if isinstance(self.event, (forgejo.pr.Comment, pagure.pr.Comment)):

There may be more lines of code where a similar fix needs to be done.

[fullsend-ai-triage]

🤖 Finished Triage · ❌ Failure (creating sandbox: sandbox creation failed after 3 attempts: sandbox create failed: exit status 2 (output: error: unexpected argument '--detach' found tip: to pass '--detach' as a value, use '-- --deta…) · Started 10:23 AM UTC · Completed 10:23 AM UTC

Commit: cc8356c · View workflow run →

Effort: high