Add Copilot instructions for release PRs #1026

Job	Run time
Upload debug artifacts after failure in analyze (default)	3m 17s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 54s
Upload debug artifacts after failure in analyze (linked)	3m 16s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 35s
Download and check debug artifacts after failure in analyze	10s
	12m 12s

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