feat: Moved preheatImage struct and parseManifestURL from manager/job… #8498

Job	Run time
compatibility_e2e_tests (scheduler)	38m 7s
compatibility_e2e_tests (manager)	38m 4s
compatibility_e2e_tests (client)	37m 22s
compatibility_e2e_tests (seed-client)	38m 6s
compatibility_e2e_tests (scheduler)	41m 31s
compatibility_e2e_tests (manager)	42m 4s
compatibility_e2e_tests (client)	41m 2s
compatibility_e2e_tests (seed-client)	43m 49s
	5h 20m 5s

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