Run mypy_primer

Prohibit assignment to class (Fixes #7724) #8610

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Run time

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Job	Run time
Run mypy_primer (0)	32m 5s
Run mypy_primer (1)	29m 26s
Run mypy_primer (2)	30m 49s
Run mypy_primer (3)	24m 42s
Run mypy_primer (4)	23m 11s
Join artifacts	2s
	2h 20m 15s