Add Copilot instructions for release PRs #4266

Job	Run time
Resolve environment (macos-latest, default)	1m 50s
Resolve environment (macos-latest, linked)	1m 47s
Resolve environment (ubuntu-latest, default)	36s
Resolve environment (ubuntu-latest, linked)	36s
Resolve environment (ubuntu-latest, nightly-latest)	44s
Resolve environment (macos-latest, nightly-latest)	2m 32s
Resolve environment (windows-latest, linked)	2m 14s
Resolve environment (windows-latest, default)	2m 10s
Resolve environment (windows-latest, nightly-latest)	2m 15s
	14m 44s

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