Use waiting room Gravity placements #6258

Job	Run time
build-and-check	3m 9s
test-integration-packages/internal	1m 6s
test-integration-packages/billing	1m 9s
test-integration-packages/agent-runtime	50s
test-integration-cli	49s
test-integration-web	50s
test-integration-common	43s
test-integration-sdk	1m 18s
test-cli	1m 2s
test-.agents	51s
test-packages/internal	58s
test-sdk	52s
test-packages/agent-runtime	46s
test-common	48s
test-packages/billing	48s
test-web	1m 52s
	17m 51s

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