Check for `truthy-bool` in `not ...` unary expressions #13163

Job	Run time
Test mypyc suite with 32-bit Python	7m 8s
Test suite with Python nightly	14m 35s
Test suite with py38-ubuntu, mypyc-compiled	18m 5s
Test suite with py38-windows-64	20m 27s
Test suite with py39-ubuntu	16m 46s
Test suite with py310-ubuntu	15m 31s
Test suite with py311-ubuntu, mypyc-compiled	15m 50s
Test suite with py312-ubuntu, mypyc-compiled	18m 0s
mypyc runtime tests with py39-macos	4m 10s
mypyc runtime tests with py38-debug-build-ubuntu	4m 20s
Type check our own code (py38-ubuntu)	1m 52s
Type check our own code (py38-windows-64)	2m 23s
Formatting and code style with Black + ruff	32s
	2h 19m 39s

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