Automatic merge from submit-queue (batch tested with PRs 49305, 54158). 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>.

apiextensions: fix LastTransitionTime for NamesAccepted condition

Fixes #54148. 

Without this change, `LastTransitionTime` for the NamesAccepted condition for CRDs always showed up as `null`.

**Release note**:

```release-note
NONE
```