fix: restore loglevel in TestBase.withoutLogging #1899
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sc.setLogLevel is a thin wrapper around log4j, so we can retrieve the current loglevel from log4j instead of resetting to "WARN"
https://github.com/apache/spark/blob/4be566062defa249435c4d72eb106fe7b933e023/core/src/main/scala/org/apache/spark/util/Utils.scala#L2330