[hotfix][runtime] Change return type for methods Execution#processFail(...)

[GJL]

What is the purpose of the change

Change return types of above methods to void.

Brief change log

• See commit

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, 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 86994e9 (Wed Oct 16 08:17:47 UTC 2019)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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• ❓ 5. Overall code [quality] is good.

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CI report:

• 86994e9 : SUCCESS Build

[GJL]

Merged manually.