Replace upload of mypy to codecov with artifact upload #711

Job	Run time
mypy	3m 32s
py3.13 \| macos \| integration tests	16m 29s
py3.13 \| macos \| unit tests	7m 7s
py3.13 \| ubuntu \| integration tests	16m 29s
py3.13 \| ubuntu \| unit tests	10m 7s
py3.13 \| windows \| integration tests	26m 21s
py3.13 \| windows \| unit tests	12m 14s
py3.10 \| ubuntu \| integration tests	15m 16s
py3.10 \| ubuntu \| unit tests	10m 55s
py3.11 \| ubuntu \| unit tests	10m 30s
py3.12 \| ubuntu \| unit tests	10m 34s
merge-test-artifacts	4s
	2h 19m 38s

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