[Feature][Zeta] Update default value for job.mode to BATCH

[hailin0]

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Description

flink
https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-core/seatunnel-flink-starter/seatunnel-flink-starter-common/src/main/java/org/apache/seatunnel/core/starter/flink/execution/FlinkExecution.java#L81

spark
https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-core/seatunnel-spark-starter/seatunnel-spark-starter-common/src/main/java/org/apache/seatunnel/core/starter/spark/execution/SparkExecution.java#L52

zeta does not set a default value
https://github.com/apache/incubator-seatunnel/blob/dev/seatunnel-engine/seatunnel-engine-core/src/main/java/org/apache/seatunnel/engine/core/parse/MultipleTableJobConfigParser.java#L228

Usage Scenario

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Related issues

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

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