Clean up waiting room UI #6357

Job	Run time
build-and-check	3m 9s
test-integration-packages/internal	1m 14s
test-integration-packages/billing	1m 6s
test-integration-sdk	1m 14s
test-integration-web	41s
test-integration-cli	39s
test-integration-common	46s
test-integration-packages/agent-runtime	42s
test-packages/billing	46s
test-web	1m 4s
test-packages/agent-runtime	48s
test-cli	54s
test-.agents	49s
test-packages/internal	45s
test-common	43s
test-sdk	42s
	16m 2s

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