Add Copilot instructions for release PRs #7401

Job	Run time
Packaging: Config and input (ubuntu-latest, linked)	1m 21s
Packaging: Config and input (ubuntu-latest, default)	1m 4s
Packaging: Config and input (macos-latest, default)	1m 15s
Packaging: Config and input (macos-latest, linked)	1m 12s
Packaging: Config and input (windows-latest, nightly-latest)	3m 3s
Packaging: Config and input (ubuntu-latest, nightly-latest)	1m 23s
Packaging: Config and input (windows-latest, default)	6m 42s
Packaging: Config and input (windows-latest, linked)	3m 19s
Packaging: Config and input (macos-latest, nightly-latest)	1m 18s
	20m 37s

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