fix fan out matrix task failed due to result ref

[chengjoey]

Changes

fix fan out matrix task failed due to result ref

fixes #8324

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[chengjoey]

/kind bug

[chengjoey]

/hold

this can successfully fan out the matrix task, but need to determine whether we should do this.

and need to add tests

[tekton-robot]

@chengjoey: 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	c48ebd6	link	true	/test pull-tekton-pipeline-unit-tests

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