test(gcp): set up periodic cleanup of pipelineruns for kf-ci-v1. Fixes #750

[Bobgy]

Fixes #750
/cc @PatrickXYS
this can be useful for AWS test infra too

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Bobgy

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[Bobgy]

I'll self approve to quickly verify on GCP test infra

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[k8s-ci-robot]

@Bobgy: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
kubeflow-testing-presubmit	11fd5b8	link	/test kubeflow-testing-presubmit

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[Bobgy]

test infra seems flaky, I'll force merge this one

[Bobgy]

I got an error syncing the config:

kf-ci-v1   KNV1039: Cluster-scoped configs except Namespaces MUST be declared in `cluster/`. To fix, move the ClusterRole to `cluster/`.

source: namespaces/cleanup/rbac.authorization.k8s.io_v1_clusterrole_cleanup.yaml
namespace: cleanup
metadata.name: cleanup
group: rbac.authorization.k8s.io
version: v1
kind: ClusterRole

[PatrickXYS]

Thanks @Bobgy

Looks like Tekton Pipeline doesn't support GC, which requires CronJobs to GC.