Automatic merge from submit-queue (batch tested with PRs 60465, 61773, 61371, 61146). 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 more e2e subpath tests

**What this PR does / why we need it**:
Adds e2e tests for detecting subpath cleanup failures:
* Add wait for pod deletion to the end of subpath tests
* Add subpath as file test case
* Add subpath as file with container restart test case
* Refactor atomic volume tests

**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 #61178

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```