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Do not validate change-note file names or frontmatter #4977

Job	Run time
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 45s
Upload debug artifacts after failure in analyze (default)	1m 54s
Upload debug artifacts after failure in analyze (nightly-latest)	1m 39s
Upload debug artifacts after failure in analyze (linked)	1m 37s
Download and check debug artifacts after failure in analyze	13s
	7m 8s