Automatic merge from submit-queue (batch tested with PRs 46094, 48544, 48807, 49102, 44174)

Shared Informer Run blocks until all goroutines finish

**What this PR does / why we need it**:
Makes Shared Informer Run method block until all goroutines it spawned finish. See #45454.

**Which issue this PR fixes**
Fixes #45454

**Release note**:
```release-note
NONE
```