Add Copilot instructions for release PRs #7409

Job	Run time
Packaging: Config file (ubuntu-latest, linked)	1m 18s
Packaging: Config file (ubuntu-latest, default)	1m 11s
Packaging: Config file (macos-latest, nightly-latest)	1m 13s
Packaging: Config file (ubuntu-latest, nightly-latest)	1m 13s
Packaging: Config file (macos-latest, linked)	1m 10s
Packaging: Config file (windows-latest, linked)	3m 30s
Packaging: Config file (windows-latest, default)	5m 39s
Packaging: Config file (macos-latest, default)	1m 11s
Packaging: Config file (windows-latest, nightly-latest)	3m 44s
	20m 9s

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