[SPARK-35693][SS][TEST] Add plan check for stream-stream join unit test #32836
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What changes were proposed in this pull request?
The changed unit test was introduce in #21587, to fix the planner side of thing for stream-stream join. Ideally check the query result should catch the bug, but it would be better to add plan check to make the purpose of unit test more clearly and catch future bug from planner change.
Why are the changes needed?
Improve unit test.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Changed test itself.