Add Copilot instructions for release PRs #4743

Job	Run time
Config export (ubuntu-latest, linked)	1m 12s
Config export (ubuntu-latest, nightly-latest)	1m 9s
Config export (windows-latest, nightly-latest)	3m 18s
Config export (macos-latest, nightly-latest)	1m 37s
Config export (macos-latest, linked)	1m 15s
Config export (windows-latest, linked)	3m 1s
	11m 32s

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