[release-v0.47.x] Fix Taskrun Failure for Preempted Pod of Taskrun

[khrm]

This fixes the Taskrun failure for Preempted Pod of Taskrun. In CreatePod, we stop deep copying task spec since v46.0 which causes failure when we preempt pod. Killing the pod twice or thrice should fail the Taskrun because we overwrite information about task spec in the Taskrun status and when the pod is recreated, validation will fail. Like volume mount for workspace validation will fail in the case of PVC.

Changes

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Release Notes

This fixes the Taskrun failure for Preempted Pod of Taskrun which uses PVC. 

/kind bug

[khrm]

/test pull-tekton-pipeline-integration-tests

[khrm]

/test pull-tekton-pipeline-beta-integration-tests
/test pull-tekton-pipeline-alpha-integration-tests

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/reconciler/taskrun/taskrun.go	85.3%	85.0%	-0.3

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/reconciler/taskrun/taskrun.go	85.3%	85.0%	-0.3

[vdemeester]

/lgtm

[tekton-robot]

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