[Task]: Remove Flink 1.15 and cleanup #32835
Description
What needs to happen?
Currently we have five versions of Flink support, when policy is three. Obviously we don't have to be rigid about policy. But we can probably drop 1.15 immediately and then continue from there.
Issue Priority
Priority: 2 (default / most normal work should be filed as P2)
Issue Components
- Component: Python SDK
- Component: Java SDK
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- Component: Beam YAML
- Component: Beam examples
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- Component: Beam katas
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- Component: Infrastructure
- Component: Spark Runner
- Component: Flink Runner
- Component: Samza Runner
- Component: Twister2 Runner
- Component: Hazelcast Jet Runner
- Component: Google Cloud Dataflow Runner