Remove tekton.dev/task label from taskrun of clustertasks

[piyush-garg]

This will remove the label tekton.dev/task from taskruns referencing
clustertasks. This was marked deprecated in pipeline release-v0.12.0

This PR will remove the label for next release

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Release Notes

Remove tekton.dev/task label from taskrun of clustertasks

[tekton-robot]

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[piyush-garg]

cc @bobcatfish @vdemeester @sbwsg @afrittoli @dibyom as this can be breaking change for folks using labels

And for cli, to list, for fetching last runs, and for describe commands, this will be very useful to differentiate between task and cluster tasks as this is buggy if there is task and cluster task with the same name.

[tekton-robot]

@piyush-garg: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-tekton-pipeline-integration-tests	fdef60e	link	/test pull-tekton-pipeline-integration-tests

Full PR test history. Your PR dashboard.

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[ghost]

Given deprecation of this label was only announced in 0.12.0 I suggest we close this PR until the 9 months have passed. What do others think?

[ghost]

/hold

[ghost]

I'm going to close this one since the deprecation window is going to be open for a while. I think there are a number of folks relying on these labels at the moment. Please reopen if you think this is the wrong call though!