Move Pipeline success/failure status updates to OpenShift Pipelines UI

[mnuttall]

This issue is related to https://github.ibm.com/IBMCloudPak4Apps/icpa-docs-kc/issues/686 and https://bigblue.aha.io/features/ICPAROAD-315.

PipelineRun results currently use the Tekton Dashboard Webhooks Extension Pull Request monitor to update commit statuses in GitHub with a success/failure indicator and a link to the PipelineRun in the dashboard.

The injected link should be changed to point into the OpenShift Pipelines UI. PipelineRun URLs are of the form, https://console-openshift-console.apps.[dns.domain]/k8s/ns/[namespace]/tekton.dev~v1alpha1~PipelineRun/[pipeline-run-name]. The Pipelines currently accept the Route to the dashboard as a config parameter: this will need to change as part of this work.