Automatic merge from submit-queue

Added field CollisionCount to StatefulSetStatus

**What this PR does / why we need it**:
This PR added a new field `CollisionCount` into `StatefulSetStatus`, similarly in terms of both name and semantics to the existing `CollisionCount` field in `DaemonSetStatus`.  The field will be used for collision avoidance when the `StatefulSet` controller creates name for the newest ControllerRevision, which will be done in another PR.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: #49909.

**Special notes for your reviewer**:
A second PR will include logic that actually uses the field for collision avoidance.

**Release note**:
```release-note
Added field CollisionCount to StatefulSetStatus in both apps/v1beta1 and apps/v1beta2
```