feat: add `findById` method on `DataPlaneSelectorService` #11701

Job	Run time
Checkstyle	4m 21s
Component-Tests	13m 35s
End-To-End-Tests	16m 6s
Javadoc	6m 21s
Postgresql-Integration-Tests	10m 55s
Unit-Tests	15m 15s
API-Tests	10m 45s
Upload-Test-Report	8s
Upload-Coverage-Report-To-Codecov	18s
	1h 17m 44s

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