Simplify parallelization in test-float-parse

Currently, test case generators are launched in parallel and their test
cases also run in parallel, all within the same pool. I originally
implemented this with the assumption that there would be an advantage in
parallelizing the generators themselves, but this turns out to not
really have any benefit.

Simplify things by running generators in series while keeping their test
cases parallelized. This makes the code easier to follow, and there is
no longer a need for MPSC or multiprogress bars. Additionally, the UI
output can be made cleaner.

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