FLINK-38785: Fixing the quotes issue with variable concatenation

[junmuz]

What is the purpose of the change

This change fixes improperly handled quotes when in the Flink config.sh script. Quotes removal should be done before variable concatenation.

Brief change log

This change fixes improperly handled quotes when in the Flink config.sh script.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? No
• If yes, how is the feature documented? Not applicable

[flinkbot]

CI report:

• adff910 Azure: SUCCESS

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[junmuz]

@flinkbot run azure