TaskRun reconcile and timeout found, updateTaskRunStatusForTimeout delete pod optimization

[assertion]

Changes

TaskRun reconcile and timeout found, delete pod related optimization to make sure pod deleted.

The former nil check(through switch/case) logic in pkg/reconciler/taskrun/taskrun.go -> updateTaskRunStatusForTimeout of getPod result is confusing, and the default block is unreachable, so the deleting pod related is not executed. Modify to simple condition check and fix the problem.

@imjasonh could you please help to check?

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[tekton-robot]

Hi @assertion. Thanks for your PR.

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[chmouel]

/ok-to-test

[ghost]

/lgtm

[vdemeester]

/lgtm

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