Automatic merge from submit-queue (batch tested with PRs 60302, 57921, 59042, 60126, 59561). 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>.

Remove pkg/client/unversioned

**What this PR does / why we need it**:
This is removing unused package, and moves the used bits into appropriate placeholders. 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #25442

**Special notes for your reviewer**:

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

/assign @deads2k 
/assign @sttts