Repository navigation

Backport: Skip pull_request triggered runs in private repos - 6.3 Branch #35875

Job	Run time
Core running from src / MacOS	6m 18s
Core running from src / Linux	3m 6s
Core running from src / Windows	3m 56s
Core running from build / Linux	3m 29s
Core running from build / Windows	5m 15s
Core running from build / MacOS	8m 25s
Failed workflow tasks	0s
Slack Notifications	0s
	30m 29s