Clean Up CI Commands for PipelineRun Reconcile

[adambkaplan]

Follow-up from #1972 - the test suites for PipelineRun reconcile currently rely on all the tests being in a single file.

We should use Ginkgo labels instead, and use FOCUS/other standard Ginkgo mechanisms to isolate the PipelineRun tests from the TaskRun tests.

Originally posted by @adambkaplan in #1972 (review)

[adambkaplan]

/kind cleanup