TEP-0118: Add tests for isolating valid and invalid context matrix

[EmmaMunley]

Changes

[TEP-0090: Matrix] introduced Matrix to the PipelineTask specification such that the PipelineTask executes a list of TaskRuns or Runs in parallel with the specified list of inputs for a Parameter or with different combinations of the inputs for a set of Parameters.

To build on this, Tep-0018 introduced Matrix.Include, which allows passing in a specific combinations of Parameters into the Matrix.

This commit adds isolated functionality testing for valid and invalid matrix context as a follow up to #6238.

/kind feature

Note: This is still in preview mode. Implementation logic will be added in subsequent commits.

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[EmmaMunley]

/assign @lbernick

[EmmaMunley]

/test check-pr-has-kind-label

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Test name	Commit	Details	Required	Rerun command
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[EmmaMunley]

Decided this was longer needed.