Add e2e tests for delete commands

[16yuki0702]

Expected Behavior

Delete command for Pipeline, PipelineRun, Resource, Task, TaskRun shoud be included in e2e test.
This will be added after these merged #235 #236 #237 #238

Actual Behavior

Steps to Reproduce the Problem

Additional Info

[16yuki0702]

/assign

[16yuki0702]

I thinks this is completed.
Could I close it??

[vdemeester]

@16yuki0702 indeed, thanks
/close

[tekton-robot]

@vdemeester: Closing this issue.

Details

In response to this:

@16yuki0702 indeed, thanks
/close

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