Connectors: Add API key source detection and refactor REST dispatch #27294

Job	Run time
Core running from build / Linux	1m 40s
Core running from build / MacOS	1m 33s
Core running from src / MacOS	1m 38s
Core running from src / Linux	1m 30s
Core running from src / Windows	2m 52s
Core running from build / Windows	2m 48s
Slack Notifications	0s
Failed workflow tasks	0s
	12m 1s

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