Automatic merge from submit-queue (batch tested with PRs 48406, 52819). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>..
Made image as deliberately optional in v1 Container struct.
**What this PR does / why we need it**:
Revert https://github.com/kubernetes/kubernetes/pull/47246/
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
Mark image as deliberately optional in v1 Container struct. Many objects in the Kubernetes API inherit the container struct and only Pods require the field to be set.
```
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