Merge pull request #6572 from cylc/8.4.x-sync #8644

Job	Run time
1/4	13m 10s
2/4	13m 9s
3/4	12m 14s
4/4	17m 1s
py-3-latest	18m 50s
flaky	7m 0s
_remote_background_indep_poll	5m 12s
_remote_background_indep_tcp	7m 3s
macos 1/5	22m 54s
macos 2/5	18m 4s
codecov	7s
	2h 14m 44s

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