Combine utilities in SpillManager #16907
Description
Is your feature request related to a problem or challenge?
follow-up to: #15700
This is a simple clean-up idea, see the original discussion in:
#15700 (comment)
spill_record_batch_by_size_and_return_max_batch_memory() and spill_record_batch_by_size() can be combined to re-use the code (perhaps only keep the first one)
Describe the solution you'd like
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Additional context
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