Attempt to fix Python Flink Example PostCommit

[Abacn]

follow up of #24159

• Gradle switch was added in wrong place

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[Abacn]

Run Python Examples_Flink

[Abacn]

It is not working because this option does not get exposed to java:

WARNING apache_beam.options.pipeline_options:pipeline_options.py:351 Discarding unparseable args: ['--flink-conf-dir=/home/jenkins/jenkins-slave/workspace/beam_SeedJob_Standalone/src/runners/flink/src/test/resources']