[FLINK-20927][yarn] Update configuration option in YarnConfigOptions class

[yuruguo]

What is the purpose of the change

There are many configuration options that use a not recommended method to build in YarnConfigOptions class, mainly include the following:

1. Use the deprecated method 'defaultValue' directly instead of specifying the data type.
   
2. Use String instead of Enum types.
   

Brief change log

• configuration option sets the data type in YarnConfigOptions class
• yarn.per-job-cluster.include-user-jar uses Enum instead of String in YarnConfigOptions class

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/Mesos, 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? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit 4842cfe (Fri May 28 07:08:41 UTC 2021)

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CI report:

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[rmetzger]

Thanks a lot!

I'll merge your change!