Automatic merge from submit-queue (batch tested with PRs 48118, 48159)
Ensures node becomes schedulable at the end of tests that delete nodes
**What this PR does / why we need it**: Further fixes the flakiness of "Pod Disk should be able to detach from a node which was deleted". When a node becomes ready but not schedulable, it was not included in the final node count.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#48008
**Special notes for your reviewer**: Updated a similar test, "Pod Disk should be able to detach from a node whose api object was deleted", to use an "Expect" instead of a soft error because the test needs to guarantee that the environment is *completely* reset.
**Release note**:
```release-note-none
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