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bundle2: pass the operation source down to the changegroup

Authored by Alphare.

Description

bundle2: pass the operation source down to the changegroup

This is currently not used by anything in core (and redundant with the url), the
real source information is much more useful. This is going to be used in
sidedata exchange patches coming soon.

Differential Revision: https://phab.mercurial-scm.org/D9986