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[e2e ingress-gce] Enhance cleanup logic for pre-shared-cert test
**What this PR does / why we need it**:
Pre-shared-cert test are flaky (https://k8s-testgrid.appspot.com/sig-network-gce#ingress-gce-e2e&width=5), mostly due to the orphaned ssl cert.
This PR enhances the cleanup logic to continue deleting the orphaned cert for this case (without this test will panic on TryDeleteIngress if no ingress is created).
**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 #NONE
**Special notes for your reviewer**:
/assign @rramkumar1
**Release note**:
```release-note
NONE
```
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