Add a reminder to the PR template that this is a public repo #7681

Job	Run time
Multi-language repository (ubuntu-latest, stable-v2.17.6)	4m 30s
Multi-language repository (macos-latest, stable-v2.21.4)	8m 5s
Multi-language repository (macos-latest, stable-v2.20.7)	10m 39s
Multi-language repository (macos-latest, stable-v2.19.4)	12m 43s
Multi-language repository (ubuntu-latest, stable-v2.20.7)	4m 14s
Multi-language repository (ubuntu-latest, nightly-latest)	4m 14s
Multi-language repository (ubuntu-latest, stable-v2.19.4)	4m 41s
Multi-language repository (ubuntu-latest, stable-v2.18.4)	4m 30s
Multi-language repository (macos-latest, stable-v2.18.4)	7m 8s
Multi-language repository (macos-latest, stable-v2.17.6)	7m 48s
Multi-language repository (macos-latest, default)	10m 39s
Multi-language repository (macos-latest, nightly-latest)	11m 23s
Multi-language repository (ubuntu-latest, default)	4m 36s
Multi-language repository (macos-latest, linked)	9m 28s
Multi-language repository (ubuntu-latest, linked)	5m 7s
Multi-language repository (ubuntu-latest, stable-v2.21.4)	4m 26s
	1h 54m 11s

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