[PR #4160/b5cb1d19 backport][3.21] Taught import to be able to use less than all-available workers. #4184
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This is a backport of PR #4160 as merged into main (b5cb1d1).
IMPORT_WORKERS_PERCENT is configurable in settings. We will
document/expose this in a future PR, to keep this one maximally
backportable. Default behavior remains "all workers".
fixes #4068.