[TEST] Add manual tests for checking PVC used by VM behavior

[TachunLin]

What's the test to develop? Please describe

Based on issue https://github.com/harvester/harvester/issues/5383

We need to check the test scenarios of issue #5383 and compare with our existing manual test cases. And create new manual test cases for those scenarios not exists.

Describe the items of the test development (DoD, definition of done) you'd like

• [x] Case 1: a volume on a running VM can't be resized

  • Need to create a new test case to cover this scenario

• [x] Case 2: a volume on a stopped VM can be resized

  • Already covered by: https://harvester.github.io/tests/manual/volumes/edit-volume-increase-size-form/

• [x] Case 3: a volume on a VM can't be deleted

  • Already covered by: https://harvester.github.io/tests/manual/volumes/negative-delete-volume-that-is-in-use/

• [x] Case 4: a volume without VM can be deleted

  • Need to add new test steps in: https://harvester.github.io/tests/manual/volumes/delete-volume-that-is-not-attached-to-vm/

• [x] Case 5: delete a VM with volume can work

  • Need to update test steps in: https://harvester.github.io/tests/manual/virtual-machines/delete-single-vm-all-disks/

• [x] Case 6: A volume can't be attached to another VM

  • Need to create a new test case to cover this scenario

[TachunLin]

Close this task as the test pr have been merged