Use waiting room Gravity placements (#549) #6259

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 11s
test-integration-common	45s
test-integration-cli	43s
test-integration-packages/agent-runtime	42s
test-integration-sdk	1m 10s
test-.agents	49s
test-integration-web	39s
test-web	1m 15s
test-cli	50s
test-common	52s
test-packages/billing	38s
test-sdk	54s
test-packages/agent-runtime	41s
test-packages/internal	45s
	16m 15s

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