Move copr_build_handler to short running queue

[majamassarini]

Looking at Grafana, the copr build handler tasks take less time than the copr build start/end handler tasks. The latter already are in the short running queue.
Also the highest peaks, around 12 minutes, all come from the copr build start/end handlers; the highest peak I saw for the copr build handler in the last 30 days was 4 minutes.

So I think this change is safe.

Fix #2995

[centosinfra-prod-github-app]

Build succeeded.
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[gemini-code-assist]

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[lbarcziova]

👍

[lbarcziova]

is this waiting for something or can we merge so that we can see behaviour in staging for a few days?

[majamassarini]

is this waiting for something or can we merge so that we can see behaviour in staging for a few days?

sorry, I forgot about it, I was waiting for the Monday deployment...

[centosinfra-prod-github-app]

Build succeeded.
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✔️ pre-commit SUCCESS in 1m 53s
✔️ packit-service-tests SUCCESS in 4m 08s

[centosinfra-prod-github-app]

Build succeeded (gate pipeline).
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