Fix log forwarding for PipelineRun status Completed

[sayan-biswas]

Fixes #664

Changes

Fixes logs forwarding when PipelineRun status is "Completed"

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Release Notes

NONE

[enarha]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: avinal, enarha

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