[FLINK-35378] [FLIP-453] Promote Unified Sink API V2 to Public and Deprecate SinkFunction

[MartijnVisser]

What is the purpose of the change

Promote Unified Sink API V2 to Public and Deprecate SinkFunction

Brief change log

da30c2faaa487ca03304b90553326ab189fba699 Deprecate SinkFunction, SocketClientSink and TwoPhaseCommitSinkFunction aa94e3822323bbb49bbac81a06a7535aa55c625b Promote SinkV2 interfaces b9c692d3529d093aeb0166623e0584597cd2d075 Use new V2 DiscardingSink 2a11eeb437b6ddbdcf5c9e9fba9b0205ef88c220 Use new PrintSink 50b7df7bcec79ae1d990d8184eb77f32942f8e7a Promote PrintSink from @PublicEvolving to @Public

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): 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, 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:

• 567dafa3dcc8826261d5e52ffecc4a2ecb36586e Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[MartijnVisser]

@flinkbot run azure