fix: stepaction resolution should respect task's namespace

[waveywaves]

Changes

When resolving StepActions using the Cluster resolver, the system should always use the Task's namespace rather than falling back to the TaskRun's namespace. Prior to this StepActions were incorrectly being looked up in the Pipeline's namespace instead of the Task's namespace. fixes

fixes #https://github.com/tektoncd/pipeline/issues/8380

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Release Notes

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[waveywaves]

/kind bug

[vdemeester]

We probably need to do this for all resolvers and types.

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