Coverage: Implement fail_under #2303

Job	Run time
Run tests (3.10.4)	15s
Run tests (3.11)	7s
Run tests (3.9.12)	15s
Run tests (3.11.0)	15s
Run tests (3.12.0)	17s
Run tests (3.13.0)	15s
Run tests (3.10)	9s
Run tests (3.12)	10s
Run tests (3.9)	12s
Run tests (3.14)	17s
Run tests (3.13)	9s
Run tests (pypy3.9)	8s
Run tests (pypy3.10)	10s
Run tests (pypy3.11)	10s
Create an issue if daily tests failed	0s
Report coverage	0s
	2m 49s

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