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bisect: replace try:/finally: by a "restore_state" context manager

Authored by dlax.

Description

bisect: replace try:/finally: by a "restore_state" context manager

This should help pytype to not consider "bgood" variable as NameError.
See https://phab.mercurial-scm.org/D7384 for context.

Differential Revision: https://phab.mercurial-scm.org/D7430