Added Namespaced Scope Interceptor. A namespaced admin can create and manage its interceptor without requiring elevated permissions. Fixes #1364

Changes

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• [x] Includes tests (if functionality changed/added)
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Release Notes

The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1alpha1/namespaced_interceptor_defaults.go	Do not exist	N/A
pkg/apis/triggers/v1alpha1/namespaced_interceptor_types.go	Do not exist	100.0%
pkg/apis/triggers/v1alpha1/namespaced_interceptor_validation.go	Do not exist	100.0%

The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1alpha1/namespaced_interceptor_defaults.go	Do not exist	N/A
pkg/apis/triggers/v1alpha1/namespaced_interceptor_types.go	Do not exist	100.0%
pkg/apis/triggers/v1alpha1/namespaced_interceptor_validation.go	Do not exist	100.0%
pkg/reconciler/namespacedinterceptor/controller.go	Do not exist	0.0%
pkg/reconciler/namespacedinterceptor/namespacedinterceptor.go	Do not exist	90.9%

The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1alpha1/namespaced_interceptor_defaults.go	Do not exist	N/A
pkg/apis/triggers/v1alpha1/namespaced_interceptor_types.go	Do not exist	100.0%
pkg/apis/triggers/v1alpha1/namespaced_interceptor_validation.go	Do not exist	100.0%
pkg/reconciler/namespacedinterceptor/controller.go	Do not exist	0.0%
pkg/reconciler/namespacedinterceptor/namespacedinterceptor.go	Do not exist	90.9%

/test pull-tekton-triggers-build-tests

/test pull-tekton-triggers-integration-tests

[APPROVALNOTIFIER] This PR is NOT APPROVED

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The following is the coverage report on the affected files. Say /test pull-tekton-triggers-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/triggers/v1alpha1/namespaced_interceptor_defaults.go	Do not exist	N/A
pkg/apis/triggers/v1alpha1/namespaced_interceptor_types.go	Do not exist	100.0%
pkg/apis/triggers/v1alpha1/namespaced_interceptor_validation.go	Do not exist	100.0%
pkg/reconciler/namespacedinterceptor/controller.go	Do not exist	0.0%
pkg/reconciler/namespacedinterceptor/namespacedinterceptor.go	Do not exist	90.9%

@khrm: PR needs rebase.

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Opening a new pr with different CRD name.