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Fix path-resolution bug in `changenotes.mts validate` by using `getChangenotes` #4734

Job	Run time
Upload debug artifacts after failure in analyze (nightly-latest)	1m 48s
Upload debug artifacts after failure in analyze (default)	1m 47s
Upload debug artifacts after failure in analyze (linked)	1m 45s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 59s
Download and check debug artifacts after failure in analyze	14s
	7m 33s