Delete taskruns related to pipeline

[ghost]

Changes

Fixes #588

This PR updates the deleter helper to support removing multiple kinds of related resources and adds some testing around that behaviour.

This PR then updates the pipeline delete command so that specifying --all causes related taskruns as well as pipelineruns to be deleted.

Submitter Checklist

• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
• Regenerate the manpages and docs with make docs and make man if needed.
• Run the code checkers with make check
• Commit messages follow commit message best practices

See the contribution guide
for more details.

Release Notes

Deleting a pipeline with the --all flag will now delete related taskruns as well as pipelineruns.

[tekton-robot]

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[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/cmd/pipeline/delete.go	93.9%	88.6%	-5.3
pkg/helper/deleter/deleter.go	50.0%	100.0%	50.0

[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/cmd/pipeline/delete.go	93.9%	88.6%	-5.3
pkg/helper/deleter/deleter.go	50.0%	100.0%	50.0

[ghost]

Actually... I don't think we need this after all! Deleting a pipeline run also deletes the taskruns that it generated.

[ghost]

lol, I misread the feature request and implemented something nobody asked for.

We want to delete taskruns of pipelineruns. I believe this happens automatically when deleting a pipelinerun:

λ kubectl get pipelineruns
NAME                  SUCCEEDED   REASON    STARTTIME   COMPLETIONTIME
demo-pipeline-run-1   Unknown     Running   7s          

λ kubectl get taskruns
NAME                                            SUCCEEDED   REASON      STARTTIME   COMPLETIONTIME
demo-pipeline-run-1-build-skaffold-app-588ps    Unknown     Pending     1s          
demo-pipeline-run-1-build-skaffold-web-z8fx8    Unknown     Pending     1s          
demo-pipeline-run-1-skaffold-unit-tests-997cv   True        Succeeded   9s          1s

λ tkn pr delete demo-pipeline-run-1
Are you sure you want to delete pipelinerun "demo-pipeline-run-1" (y/n): y
PipelineRun deleted: demo-pipeline-run-1

λ kubectl get pipelineruns
No resources found in default namespace.

λ kubectl get taskruns
No resources found in default namespace.

[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/cmd/pipeline/delete.go	93.9%	88.6%	-5.3
pkg/helper/deleter/deleter.go	50.0%	100.0%	50.0