Ignore deletion_delay_hours when importing during TestAccVmwareenginePrivateCloud_vmwareEnginePrivateCloudUpdate

[modular-magician]

Addresses issues like this when testing import of the resource:

------- Stdout: -------
=== RUN   TestAccVmwareenginePrivateCloud_vmwareEnginePrivateCloudUpdate
=== PAUSE TestAccVmwareenginePrivateCloud_vmwareEnginePrivateCloudUpdate
=== CONT  TestAccVmwareenginePrivateCloud_vmwareEnginePrivateCloudUpdate
    vcr_utils.go:152: Step 2/4 error running import: ImportStateVerify attributes not equivalent. Difference is shown below. The - symbol indicates attributes missing after import.
          map[string]string{
        -   "deletion_delay_hours": "1",
          }
    testing_new.go:90: Error running post-test destroy, there may be dangling resources: exit status 1
        Error: Error waiting to delete PrivateCloud: got pending status "found"
--- FAIL: TestAccVmwareenginePrivateCloud_vmwareEnginePrivateCloudUpdate (17756.87s)
FAIL

This field is a virtual field (GoogleCloudPlatform/magic-modules#10764) so doesn't have a value immediately after import.

Release Note Template for Downstream PRs (will be copied)

Derived from GoogleCloudPlatform/magic-modules#11295

[github-actions]

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