Automatic merge from submit-queue (batch tested with PRs 60475, 60514, 60506, 59903, 60319). 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>.
[e2e ingress-gce] Add test for backside re-encryption
**What this PR does / why we need it**:
Add a basic e2e testcase for ingress backside re-encryption. echoheaders image with HTTPS support was added by https://github.com/kubernetes/ingress-nginx/pull/2091.
**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 @nicksardo @rramkumar1
cc @nikhiljindal
**Release note**:
```release-note
NONE
```
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