[Task]: Remove Flink 1.16 support and clean up

[kennknowles]

What needs to happen?

Flink 1.16 is very old and has been unsupported by Flink for a long time. We now support 1.17 and 1.18 and 1.19 so we can drop 1.16.

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

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