[TEST] Fix loglevel restore behavior of KyuubiFunSuite#withLogAppender
#4985
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Why are the changes needed?
This method is forked from Apache Spark, and recently, SPARK-44074 identified and fixed the issue about loglevel restore behavior.
How was this patch tested?
Add some test cases that check the changes thoroughly including negative and positive cases if possible
Add screenshots for manual tests if appropriate
Run test locally before make a pull request