Remove `while True` in AgentController #5867

Job	Run time
Build App Image	7m 43s
Build Image (nikolaik/python-nodejs:python3.12-nodejs22, nikolaik)	4m 46s
RT Unit Tests (Root) (nikolaik)	10m 52s
RT Unit Tests (openhands) (nikolaik)	10m 38s
Update PR Description	5s
Verify Hash Equivalence in Runtime and Docker images (nikolaik)	59s
All Runtime Tests Passed	1s
All Runtime Tests Passed	0s
	35m 4s

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