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Rework the way we process snapshots and branches

Nicolas Dandrimont requested to merge generated-differential-D417-source into generated-differential-D417-target

The previous code uses a brittle double-iteration and would break in a subtle way when having several branches pointing at the same target. Surprisingly, we didn't notice it before, even though most snapshots have a HEAD and refs/heads/master branch pointing to the same object.

I've also added FIXMEs for things I noticed should be changed in the long run.

Depends on !54 (closed)

Test Plan

the test case has been updated to exert the issue in the old code

Migrated from D417 (view on Phabricator)

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