Add e2e tests for webhook

[savitaashture]

As part of Operator we have added custom webhook implementation to handle

• Adding of proxy related env for all the pods created by tekton during runtime.
• Adding annotation to Triggers Eventlistener in order to handle autocreation of certs for Openshift

right now there are no E2E to test webhook implementation.

This issue is to track the same

[tekton-robot]

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Mark the issue as fresh with /remove-lifecycle stale with a justification.
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/lifecycle stale

Send feedback to tektoncd/plumbing.

[nikhil-thomas]

/remove-lifecycle stale
this is very important.
😬 looks like operator-framework/community-operators#3971 not merging because of a webhook related crash.

[nikhil-thomas]

/lifecycle frozen