[BugFix][Flink Jar]Fix FLINK JAR submission

[zackyoungh]

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This pull request is code cleanup without any test coverage.

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This change added tests and can be verified as follows:

[aiwenmo]

LGTM

[jiangwwwei]

args should not directly use the pretreatStatement() method because it will interpret everything from "--" onwards in args as comments and clear it.

for example:
String args="--key1 value1 --key 2 value2" ;
pretreatStatement(args) -> ""

It is recommended to replace variables directly using getVariableManager().parseVariable(args).