infinitepush: use bundleoperation.source instead of hacking on tr
Previous patches added a soutce attribute to bundle2.bundleoperation class which
stores the command which leads to current bundleoperation. Let's use that to
decide whether a processing a `hg unbundle` or not instead of hacking on
transaction.
Differential Revision: https://phab.mercurial-scm.org/D2997
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