KAFKA-19058 Running the streams/streams-scala module tests produces a streams-scala.log (#19324)

Remove streams-scala module log4j2 file appender.

Reviewers: PoAn Yang <payang@apache.org>, Matthias J. Sax <matthias@confluent.io>

streams/streams-scala/src/test/resources/log4j2.yaml

@@ -21,20 +21,12 @@ Configuration:
 
   Appenders:
     Console:
-      name: A1
-    RollingFile:
-      - name: R
-        fileName: logs/kafka-streams-scala.log
-        filePattern: "streams-scala-%d{yyyy-MM-dd}.log"
+      name: STDOUT
       PatternLayout:
         pattern: "${logPattern}"
-        SizeBasedTriggeringPolicy:
-          size: "100KB"
-        DefaultRolloverStrategy:
-          max: 1
 
   Loggers:
     Root:
       level: INFO
       AppenderRef:
-        - ref: R
+        - ref: STDOUT