[FLINK-38762][runtime] Introduce SingleJobApplication

[eemario]

What is the purpose of the change

This pull request introduces SingleJobApplication that is used in session mode to run a single job in an application.

Brief change log

• Add the SingleJobApplication implementation
• Refactor JarRunHandler and JobSubmitHandler to use SingleJobApplication instead of submitJob directly

Verifying this change

This change added tests and can be verified as follows:

• Added tests that validate the core interfaces of SingleJobApplication
• Added tests that validate the Dispatcher's application management behavior
• Updated integration tests that validate the new behavior of JarRunHandler and JobSubmitHandler
• Manually verified the change by running a standalone cluster in session mode

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, Kubernetes/Yarn, 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)

[flinkbot]

CI report:

• 3370399 Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

• @flinkbot run azure re-run the last Azure build

[zhuzhurk]

LGTM.