Remove `WithMockOauth2User` annotation and related classes #4591

Job	Run time
build	3m 47s
unit_tests	4m 24s
controller_tests - Organization	5m 4s
controller_tests - Workspace	5m 36s
controller_tests - Run	5m 12s
controller_tests - Solution	4m 59s
controller_tests - Home	4m 50s
controller_tests - Dataset	5m 3s
integration_tests - Organization	5m 16s
integration_tests - Solution	5m 0s
controller_tests - Runner	4m 52s
integration_tests - Workspace	5m 24s
integration_tests - Dataset	5m 38s
controller_tests - Meta	4m 47s
integration_tests - Runner	5m 43s
integration_tests - Run	5m 6s
scan_and_push_container_images_to_registries	4m 24s
	1h 25m 5s

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