Repo: retire new_in_branch() and notion of "bound" branch0.14

Binding (or "pegging") a Repo at a particular branch via new_in_branch()
increases the cognitive burden since the reader must maintain a mental
model of which Repo instances are pegged and which are not. This burden
outweighs whatever minor convenience (if any) is gained by pegging the
Repo at a particular branch. It is easier to reason about the code when
the branch name is passed to clients directly rather than indirectly via
a pegged Repo.

Preceding patches retired all callers of new_in_branch(), therefore
remove it.

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Alberto Bertogli <albertito@blitiri.com.ar>

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