Storing PipelineRun and TaskRun deletion metadata

[khrm]

Earlier, data coming during deletion like timestamp weren't stored. This PR fixes that.

Changes

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Release Notes

NONE

[khrm]

/kind bug

[khrm]

/assign @enarha @avinal @vdemeester

[khrm]

/cherry-pick @release-v0.12.x

[tekton-robot]

@khrm: once the present PR merges, I will cherry-pick it on top of @release-v0.12.x in a new PR and assign it to you.

In response to this:

/cherry-pick @release-v0.12.x

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/watcher/reconciler/pipelinerun/reconciler.go	30.5%	30.0%	-0.5

[tekton-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[khrm]

/test pull-tekton-results-build-tests

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/watcher/reconciler/pipelinerun/reconciler.go	30.5%	30.0%	-0.5