Site Health: Add common HTTP response headers for page cache detection. #23407

Job	Run time
QUnit Tests / Run QUnit tests	2m 28s
Slack Notifications / Prepare notifications	5s
Slack Notifications / Success notifications	3s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	-1s
	2m 35s

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