Re-enable parallel for KafkaIO precommit (#35814)

* Update beam_PreCommit_Java_Kafka_IO_Direct.yml

Enable parallel for KafkaIO precommit

* limit max workers

* Update beam_PreCommit_Java_Kafka_IO_Direct.yml

Author: Abacn

.github/workflows/beam_PreCommit_Java_Kafka_IO_Direct.yml

@@ -100,7 +100,7 @@ jobs:
           arguments: |
             -PdisableSpotlessCheck=true \
             -PdisableCheckStyle=true \
-            --no-parallel \
+          max-workers: 4
       - name: Archive JUnit Test Results
         uses: actions/upload-artifact@v4
         if: ${{ !success() }}