Tekton triggers needs to be installed using KIT env

Today we need these resources for running triggers on Kit environment
https://github.com/awslabs/kubernetes-iteration-toolkit/blob/main/tests/triggers/rbac.yaml

It needs to be installed like these - https://github.com/awslabs/kubernetes-iteration-toolkit/blob/main/substrate/pkg/controller/substrate/cluster/addons/tekton.go#L26 , so we don't have to manually do it.

Start with tests/triggers/rbac.yaml and compare it with the installation pattern at substrate/pkg/controller/substrate/cluster/addons/tekton.go#L26 in the KIT repository. Trace where KIT environment addons are configured; done means the trigger resources are installed automatically so manual application of rbac.yaml is no longer required.

Written by the indexing model from the issue text.