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Add rotatable proxy tokens and a proxy-only key for internal API routes #1989

Job	Run time
build and typecheck (ubuntu-latest)	1m 23s
test (ubuntu-latest, unit)	2m 12s
test (ubuntu-latest, 1/2)	1m 43s
test (ubuntu-latest, 2/2)	1m 37s
live-e2e	0s
done	4s
	6m 59s