Run tests / chore: enable nullable annotations for part of files (#2944) #2278

Job	Run time
test-linux (ubuntu-24.04-arm)	56m 40s
test-pack	4m 13s
spellcheck-docs	13s
test-windows-full (windows-11-arm)	30m 17s
test-linux (ubuntu-latest)	53m 43s
test-windows-full (windows-latest)	47m 30s
test-windows-core (windows-latest)	1h 11m 46s
test-windows-core (windows-11-arm)	55m 25s
test-macos (x64)	1h 12m 0s
test-macos (arm64)	1h 5m 35s
	7h 37m 22s

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