[FLINK-26280][table-planner] Add 'table.exec.legacy-transformation-uids' to support old transformation uid generation behaviour

[slinkydeveloper]

Per discussion here https://issues.apache.org/jira/browse/FLINK-25932

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[slinkydeveloper]

@twalthr seems like when the flag is deprecated, the docs generator ignores it. At least, i tried to generate, but nothing changed. Perhaps for this flag is better to not show it in the docs? WDYT?

[twalthr]

Thanks @slinkydeveloper. Can we add at least one test for this? I think org.apache.flink.table.planner.plan.nodes.exec.TransformationsTest would be a good location to quickly check a pipeline from source -> one or two operators -> sink.

Not having it in the docs is fine with me.

[twalthr]

LGTM

[slinkydeveloper]

@flinkbot run azure

[matriv]

LGTM