[release-v0.68.x] fix: avoid fan out matrix task failed due to result ref

[tekton-robot]

This is an automated cherry-pick of #8487

/assign savitaashture

fix: avoid fan out matrix task failed due to result ref

[tekton-robot]

@tekton-robot: GitHub didn't allow me to assign the following users: savitaashture.

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In response to this:

This is an automated cherry-pick of #8487

/assign savitaashture

fix: avoid fan out matrix task failed due to result ref

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[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/pipelinerun/pipelinerun.go	91.6%	91.7%	0.1
pkg/reconciler/pipelinerun/resources/pipelinerunresolution.go	96.5%	96.2%	-0.3

[vdemeester]

/kind bug
/approve
/lgtm

[tekton-robot]

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