[SPARK-38045][SS][TEST][3.2] More strict validation on plan check for stream-stream join unit test #35347
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What changes were proposed in this pull request?
This PR is a follow-up of SPARK-35693 to enhance the unit test on stream-stream join to be more strict on plan check.
Why are the changes needed?
We would like to be more strict on plan check so that requirement of distribution against stream-stream join is fulfilled.
Does this PR introduce any user-facing change?
No, test only.
How was this patch tested?
Modified test passed.