Fix --keep with TaskRun and PipelineRun Delete when Using --task or --pipeline Flags

[danielhelfand]

Closes #965

This pull request makes --keep compatible with tkn tr delete --task and tkn pr delete --pipeline. With these changes, tkn tr delete --task taskName --keep 2 would filter TaskRuns by a Task name and keep the most recent 2 TaskRuns associated with the Task taskName.

Deletion confirmation messages have been updated for this case as follows:

$ tkn pr delete --pipeline pipelineName --keep 2

Are you sure you want to delete all pipelineruns related to pipeline "pipelineName" keeping 2 pipelineruns (y/n): 
All but 2 PipelineRuns associated with Pipeline "pipelineName" deleted in namespace "ns"

$ tkn pr delete --pipeline pipelineName 

Are you sure you want to delete all pipelineruns related to pipeline "pipelineName" (y/n): 
All PipelineRuns associated with Pipeline "pipelineName" deleted in namespace "ns"

This pull request also fixes tests associated with --keep with TaskRun, which had no Task test data set up for the test. This resulted in the tests not adequately testing if the correct output was received.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow commit message best practices

Release Notes

Make --keep compatible with --task and --pipeline flag for taskrun and pipelinerun delete

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/cmd/pipelinerun/delete.go	90.0%	93.0%	3.0
pkg/cmd/taskrun/delete.go	87.1%	93.0%	5.8
pkg/options/delete.go	92.6%	93.3%	0.7

[vdemeester]

@danielhelfand needs a rebase 😅

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/cmd/pipelinerun/delete.go	90.0%	93.0%	3.0
pkg/cmd/taskrun/delete.go	87.1%	93.0%	5.8
pkg/options/delete.go	92.6%	93.3%	0.7

[danielhelfand]

/test pull-tekton-cli-integration-tests-0_10

[danielhelfand]

@danielhelfand needs a rebase 😅

@vdemeester Rebased. If it looks good, would be great to still consider for v0.10.0 if not too late.

[vdemeester]

/cc @piyush-garg @pradeepitm12 @chmouel

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vdemeester

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[chmouel]

/lgtm

very nice thanks,

(i wasn't able to test this directly but the code and tests looks good)