Revert #30533: Automatically execute unbounded pipelines in streaming mode.

[damondouglas]

This reverts commit 1c55117.

This commit has been associated with failures related to data sampling in Dataflow.

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[riteshghorse]

Thanks!

[riteshghorse]

Do we have any issue tracking this or failure run we can link?

[damccorm]

My understanding is that this has caused some Dataflow tests to fail, but has it actually had negative impact on real pipelines? Is the problem here or is it with the tests themselves?

FYI @robertwb

[kennknowles]

The description is not accurate - we have an underlying bug in dataflow and some erroneous tests. The original commit was a correct change. This is reverted while we fix our tests and service.

[kennknowles]

The tests are entirely internal to Google so there is no externally tracked failure. You would have to write a pipeline with unbounded data and then insist on running it in batch mode, which presumably not many people do since it has undefined/arbitrarily wrong behavior.