Add Copilot instructions for release PRs #7403

Job	Run time
Packaging: Config and input (ubuntu-latest, linked)	1m 15s
Packaging: Config and input (ubuntu-latest, default)	1m 11s
Packaging: Config and input (windows-latest, linked)	3m 2s
Packaging: Config and input (macos-latest, linked)	1m 9s
Packaging: Config and input (macos-latest, default)	1m 21s
Packaging: Config and input (windows-latest, default)	3m 6s
Packaging: Config and input (macos-latest, nightly-latest)	1m 12s
Packaging: Config and input (ubuntu-latest, nightly-latest)	1m 10s
Packaging: Config and input (windows-latest, nightly-latest)	3m 38s
	17m 4s

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