Automatic merge from submit-queue (batch tested with PRs 56390, 56334, 55572, 55598, 56563). 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>.

add apiServerCertSANs case for test GetAltNames

**What this PR does / why we need it**:

When fix #55566 , found there is not test case for apiServerCertSANs 

**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 #

**Special notes for your reviewer**:

assgin @luxas 

**Release note**:

```release-note
NONE
```