Automatic merge from submit-queue (batch tested with PRs 49017, 45440, 48384, 45894, 48808)

Export BaseControllerRefManager

**What this PR does / why we need it**:
It exports go struct `baseControllerRefManager`. This is needed so other distributions like OpenShift or TPR controllers can reuse that code for writing ref managers for other objects. 

**Release note**:
It is not worthy of a release note.