mypy

Add PyManager troubleshooting steps for direct launch of script files… #17957

Job	Run time
Run mypy on Lib/test/libregrtest	22s
Run mypy on Tools/peg_generator	18s
Run mypy on Tools/jit	21s
Run mypy on Tools/build	23s
Run mypy on Lib/tomllib	21s
Run mypy on Tools/cases_generator	17s
Run mypy on Tools/clinic	20s
Run mypy on Lib/_pyrepl	19s
	2m 41s

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