[FLINK-14969][tests] Refactor CliFrontendRunWithYarnTest reflect to new execution codepath

[tisonkun]

What is the purpose of the change

After commit 8379bc5 merged as part of FLINK-14851, CliFrontendRunWithYarnTest currently runs in a different way from that was previously. Thus we need to refactor CliFrontendRunWithYarnTest reflect to the new execution codepath.

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): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

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Automated Checks

Last check on commit 0e8a517 (Wed Dec 04 15:56:16 UTC 2019)

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[kl0u]

LGTM!