Update kustomization files to fix operator nightly issue

[savitaashture]

Changes

Issue: Operator nightly fails with below error

2021/09/09 05:58:05 got file '300-operator_v1alpha1_dashboard_crd.yaml', but '/go/src/github.com/tektoncd/operator/config/base/300-operator_v1alpha1_dashboard_crd.yaml' must be a directory to be a root
Error: accumulating resources: accumulating resources from '../base/300-operator_v1alpha1_dashboard_crd.yaml': security; file '/go/src/github.com/tektoncd/operator/config/base/300-operator_v1alpha1_dashboard_crd.yaml' is not in or below '/go/src/github.com/tektoncd/operator/config/kubernetes'

https://dashboard.dogfooding.tekton.dev/#/namespaces/tekton-nightly/pipelineruns/operator-release-nightly-4zw82?pipelineTask=publish-images&step=koparse

RootCause: As part of this PR #307 there are changes related to config files and kustomzation
and kustomzation doesn't allow to directly include resource files that are not in the same directory or a subdirectory of where your kustomization.yml file is located.

/cc @vdemeester @sm43 @nikhil-thomas

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[piyush-garg]

/lgtm