test: fix TestAgent_Lifecycle/ShutdownScriptOnce to wait for stats #17387
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fixes: coder/internal#576
TestAgent_Lifecycle/ShutdownScriptOnce hits error logs which cause test failures. These logs are legit errors and have to do with shutting down the agent before it has fully come up.
This PR changes the test to wait for the agent to send stats (a good indicator that it's fully up, and beyond the errors that have triggered test failures in past) before closing it.