flake: `TestWorkspaceAgent/AWS`

Seen here: https://github.com/coder/coder/actions/runs/12772795341/job/35603535700

```
    agent_test.go:131: 
        	Error Trace:	C:/a/coder/coder/coderd/coderdtest/coderdtest.go:1092
        	            				C:/a/coder/coder/cli/agent_test.go:131
        	Error:      	Condition never satisfied
        	Test:       	TestWorkspaceAgent/AWS
```