Description

Current logic of adding trigger from UI using `template.name` in Eventlisteners is a BREAKING change in 1.4 Pipelines operator, therefore update the logic to support new trigger Api and use `triggerRef` while creating the Trigger resources.

Acceptance Criteria

1. should create a new `Trigger` CR while adding other trigger resources.
2. should use `triggerRef` in Eventlistener instead of bindings & template.name(deprecated in 1.4 pipelines operator)

Additional Details: 

Backwards incompatible changes - https://github.com/tektoncd/triggers/releases/tag/v0.11.0
PR -  https://github.com/tektoncd/triggers/pull/898
example  : https://github.com/openshift/pipelines-tutorial/blob/master/03_triggers/04_event_listener.yaml