fix(pipelinerun): resolve issue with PipelineRun not timing out successfully

[l-qing]

fix #8230

cherry-pick: #8236

When the PipelineRun timeout, validation errors returned when patch a completed TaskRun should be ignored.

Changes

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[l-qing]

/kind bug

[vdemeester]

/ok-to-test

[vdemeester]

/lgtm

[tekton-robot]

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