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lfs: drop the unused progressbar code in the `filewithprogress` class

Authored by mharbison72.

Description

lfs: drop the unused progressbar code in the filewithprogress class

This has been unused since f98fac24b757, which added worker based transfers for
concurrency, shifting the progressbar maintenance to the single thread waiting
on the worker to complete. Since the name no longer fits, rename the class.

Differential Revision: https://phab.mercurial-scm.org/D7956