Unify caches #8816

Job	Run time
Flake8	15s
Examples (ubuntu-latest)	56m 0s
Documentation	5m 22s
Examples (porter)	1h 17m 56s
Emirge installation (ubuntu-latest)	5m 48s
Emirge installation (macos-latest)	9m 12s
Mypy	3m 56s
Production testing (ubuntu-latest)	1h 54m 4s
pydocstyle	11s
Pylint	4m 26s
Production testing (macos-latest)	1h 32m 55s
Production testing (porter)	1h 16m 47s
Pytest	2h 35m 53s
	10h 2m 45s

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