[SPARK-48832][CONNECT][TESTS] Add dedicated error tests for Spark Connect #47250
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What changes were proposed in this pull request?
This PR proposes to add dedicated error tests for Spark Connect
Why are the changes needed?
To improve the test coverage for Spark Connect
Does this PR introduce any user-facing change?
No, this is test-only fix.
How was this patch tested?
Extended the existing UTs.
Was this patch authored or co-authored using generative AI tooling?
No.