feat: add cli-ui-tester agent and tmux helper scripts #5366

Job	Run time
build-and-check	2m 47s
test-cli	1m 9s
test-web	1m 12s
test-integration-.agents	36s
test-.agents	46s
test-integration-packages/agent-runtime	46s
test-integration-common	42s
test-packages/agent-runtime	55s
test-packages/billing	41s
test-integration-cli	38s
test-integration-sdk	39s
test-packages/internal	48s
test-common	40s
test-integration-packages/billing	41s
test-integration-packages/internal	40s
test-integration-web	42s
test-sdk	40s
	15m 2s

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