Add Copilot instructions for release PRs #7407

Job	Run time
Packaging: Config file (macos-latest, linked)	1m 36s
Packaging: Config file (windows-latest, linked)	5m 28s
Packaging: Config file (windows-latest, default)	3m 49s
Packaging: Config file (macos-latest, default)	1m 38s
Packaging: Config file (ubuntu-latest, linked)	1m 11s
Packaging: Config file (ubuntu-latest, default)	1m 16s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 10s
Packaging: Config file (windows-latest, nightly-latest)	3m 27s
Packaging: Config file (macos-latest, nightly-latest)	1m 15s
	20m 50s

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