🤖 Pick PR #63310 (Mark class property initializers as...) into release-6.0 #35560

Job	Run time
typecheck	45s
package-size	1m 34s
knip	31s
coverage	11m 49s
lint	1m 6s
smoke	53s
browser-integration	1m 45s
misc	33s
self-check	1m 1s
format	27s
baselines	9m 17s
Test Node 14 on windows-latest	13m 56s
Test Node 24 on ubuntu-latest	8m 38s
Test Node lts/* on ubuntu-latest with --no-bundle	11m 18s
Test Node 14 on ubuntu-latest	11m 29s
Test Node 24 on windows-latest	9m 55s
required	2s
	1h 24m 59s

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