Add Copilot instructions for release PRs #7405

Job	Run time
Packaging: Action input (windows-latest, linked)	3m 6s
Packaging: Action input (macos-latest, default)	1m 17s
Packaging: Action input (ubuntu-latest, linked)	1m 12s
Packaging: Action input (ubuntu-latest, default)	1m 15s
Packaging: Action input (macos-latest, linked)	1m 20s
Packaging: Action input (ubuntu-latest, nightly-latest)	1m 22s
Packaging: Action input (windows-latest, default)	3m 19s
Packaging: Action input (macos-latest, nightly-latest)	1m 22s
Packaging: Action input (windows-latest, nightly-latest)	3m 26s
	17m 39s

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