[FLINK-21581][core] Remove @PublicEvolving from RuntimeContext.getJobID

[rkhachatryan]

What is the purpose of the change

Remove @PublicEvolving from RuntimeContext.getJobID
to make the API more consistent.

The method is added to japicmp ignore list.

Verifying this change

This change is a trivial rework 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): yes
• 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/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? no

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Automated Checks

Last check on commit 8fa482c (Wed Mar 24 04:41:20 UTC 2021)

Warnings:

• 1 pom.xml files were touched: Check for build and licensing issues.
• 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:

• 20efe7d Azure: FAILURE

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[zentol]

Change is fine but indentation is different

[rkhachatryan]

Thanks for reviewing!
I fixed the indentation. Merging (build failure is unrelated: FLINK-21970).

[KarmaGYZ]

Why not squash the fixup commit before merging it?

[rkhachatryan]

Just a stupid mistake:man_shrugging: