Coverage: Implement fail_under #2312

Job	Run time
Run tests (3.12)	14s
Run tests (3.11)	9s
Run tests (3.9.12)	15s
Run tests (3.10.4)	16s
Run tests (3.14)	17s
Run tests (pypy3.11)	14s
Run tests (3.12.0)	19s
Run tests (3.13.0)	16s
Run tests (3.13)	14s
Run tests (3.10)	13s
Run tests (pypy3.10)	16s
Run tests (3.9)	10s
Run tests (3.11.0)	20s
Run tests (pypy3.9)	11s
Report coverage	19s
Create an issue if daily tests failed	-1s
	3m 42s

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