Setting task_accepted_time before serialization

[jpodivin]

If we settask_accepted_time on the Event object before it proceeds to serialization, the value will correctly propagate to the database, and copr_build_finished_time should start getting reported again.

Since this code runs in a loop, and new times are getting appended, the last element of the list is used to set the value.

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[lbarcziova]

just one question, overall this approach LGTM, thanks!

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✔️ packit-service-tests SUCCESS in 3m 35s

[lbarcziova]

thanks!

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✔️ packit-service-tests SUCCESS in 3m 19s

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✔️ pre-commit SUCCESS in 1m 47s
✔️ packit-service-tests SUCCESS in 3m 37s

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