[release-v0.56.x] Perform matrix results validation on only result ref params

[tekton-robot]

This is an automated cherry-pick of #8089

/assign piyush-garg

Perform matrix results validation on only result ref params

[tekton-robot]

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[piyush-garg]

/kind bug

[tekton-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1/pipeline_validation.go	99.2%	99.2%	-0.0

[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/apis/pipeline/v1/pipeline_validation.go	99.2%	99.2%	-0.0

[vdemeester]

/retest

[tekton-robot]

@tekton-robot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-pipeline-unit-tests	2cb3b97	link	true	/test pull-tekton-pipeline-unit-tests

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