Setup cleanup task on jit-format workflow

[am11]

We have a cleanup action used in backport action to purge stale entries in the Actions list once a day (around 13:00 UTC). We should consider using it in jit-format workflow to delete entries up-to, e.g., success: true || created: > a week ago.

https://github.com/dotnet/runtime/actions/workflows/jit-format.yml

cc @jkoritzinsky, @akoeplinger

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[jkoritzinsky]

I thought we added the cleanup task on the comment-based workflows because they trigger too often. We don't have cleanup jobs on the filtered PR actions like MarkdownLint. Do we need one for the JIT-format job?

[am11]

Over time, the stale entries stay on the index page and GitHub deletes the logs. I think the log retention time is about a month or so, after that those entries are just occupying space.