[RayService] Move `cleanUpRayClusterInstance` from `reconcileRayClust… #355

Job	Run time
Build Ray Kubectl plugin	3m 6s
Build Operator Binaries and Docker Images	8m 47s
Build Apiserver and Docker Images	3m 46s
Build security proxy Binaries and Docker Images	1m 40s
Lint (pre-commit)	3m 5s
Python Client Test	1m 9s
Compatibility Test - 2.7.0	0s
Compatibility Test - 2.8.0	0s
Compatibility Test - 2.9.0	0s
Compatibility Test - Nightly	0s
	21m 33s

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