Add Codecov step to CI #2381

Job	Run time
Run tests (3.9.12)	22s
Run tests (3.10)	17s
Run tests (3.11.0)	24s
Run tests (3.11)	14s
Run tests (pypy3.9)	39s
Run tests (3.9)	15s
Run tests (3.13)	18s
Run tests (pypy3.10)	28s
Run tests (3.12.0)	21s
Run tests (3.10.4)	25s
Run tests (pypy3.11)	31s
Run tests (3.12)	14s
Run tests (3.14)	28s
Run tests (3.13.0)	22s
Create an issue if daily tests failed	0s
	5m 18s

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