Add conformance testing CI pipeline (#1915) #249

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	38s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, locked, ubuntu-latest)	49s
checks / test (3.12, locked, windows-latest)	3m 30s
checks / test (3.12, lowest-direct, windows-latest)	3m 41s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 34s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, locked, windows-latest)	2m 42s
checks / test (3.10, lowest-direct, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	2m 32s
checks / test (3.13, lowest-direct, ubuntu-latest)	46s
checks / test (3.11, locked, windows-latest)	2m 31s
checks / test (3.14, locked, windows-latest)	3m 53s
checks / test (3.10, locked, ubuntu-latest)	44s
checks / test (3.14, locked, ubuntu-latest)	2m 20s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.10, lowest-direct, windows-latest)	2m 27s
all-green	3s
	39m 33s

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