Add Copilot instructions for release PRs #4745

Job	Run time
Config export (ubuntu-latest, nightly-latest)	1m 8s
Config export (ubuntu-latest, linked)	1m 6s
Config export (windows-latest, linked)	2m 43s
Config export (macos-latest, linked)	1m 6s
Config export (windows-latest, nightly-latest)	2m 42s
Config export (macos-latest, nightly-latest)	1m 37s
	10m 22s

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