ci: backport conformance tests from main to v1.x #4171

Job	Run time
checks / readme-snippets	13s
checks / pre-commit	20s
checks / test (3.10, lowest-direct, windows-latest)	2m 10s
checks / test (3.10, highest, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	2m 11s
checks / test (3.12, lowest-direct, windows-latest)	3m 30s
checks / test (3.13, highest, ubuntu-latest)	48s
checks / test (3.11, highest, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	42s
checks / test (3.11, highest, windows-latest)	2m 29s
checks / test (3.10, lowest-direct, ubuntu-latest)	47s
checks / test (3.12, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, ubuntu-latest)	45s
checks / test (3.12, highest, windows-latest)	3m 52s
checks / test (3.13, lowest-direct, windows-latest)	2m 17s
checks / test (3.12, highest, ubuntu-latest)	53s
checks / test (3.10, highest, windows-latest)	2m 23s
checks / test (3.13, highest, windows-latest)	2m 23s
all-green	5s
	28m 13s

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