Use waiting room Gravity placements #6257

Job	Run time
build-and-check	2m 55s
test-integration-packages/billing	1m 18s
test-integration-packages/internal	1m 7s
test-integration-cli	44s
test-integration-web	41s
test-integration-common	51s
test-integration-packages/agent-runtime	52s
test-integration-sdk	1m 22s
test-packages/agent-runtime	46s
test-common	52s
test-.agents	45s
test-sdk	41s
test-packages/internal	49s
test-packages/billing	52s
test-cli	49s
test-web	1m 15s
	16m 39s

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