Remove copy code of FindTopRunner #370

Job	Run time
Upgrade Test	23m 29s
Integration tests with MySQL (8.0.28) / dbtest	5m 54s
Integration tests with MySQL (8.0.33) / dbtest	5m 54s
Integration tests with MySQL (8.0.34) / dbtest	6m 9s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.25.9) / e2e	42m 33s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.26.4) / e2e	40m 45s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.27.1) / e2e	47m 31s
Supported MySQL versions End-to-End Tests (8.0.28, 1.27.1) / e2e	46m 28s
Supported MySQL versions End-to-End Tests (8.0.33, 1.27.1) / e2e	51m 31s
Supported MySQL versions End-to-End Tests (8.0.34, 1.27.1) / e2e	46m 10s
	5h 16m 24s

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