Coverage: Implement fail_under #2301

Job	Run time
Run tests (3.9.12)	15s
Run tests (3.10)	9s
Run tests (3.9)	14s
Run tests (3.11)	12s
Run tests (3.11.0)	15s
Run tests (pypy3.9)	14s
Run tests (3.13.0)	20s
Run tests (3.12.0)	18s
Run tests (3.12)	13s
Run tests (3.10.4)	15s
Run tests (3.13)	14s
Run tests (3.14)	17s
Run tests (pypy3.11)	11s
Run tests (pypy3.10)	9s
Report coverage	15s
Create an issue if daily tests failed	0s
	3m 31s

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