rust-status: return a ParallelIterator instead of a Vec from stat_dmap_entries
This allows the caller function to choose when and how the iteration and/or
collection happens. This change also cleans up the now unused `filter_map`.
Differential Revision: https://phab.mercurial-scm.org/D7299
Test issue2761
$ hg init
$ touch to-be-deleted
$ hg add
adding to-be-deleted
$ hg ci -m first
$ echo a > to-be-deleted
$ hg ci -m second
$ rm to-be-deleted
$ hg diff -r 0
Same issue, different code path
$ hg up -C
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ touch does-not-exist-in-1
$ hg add
adding does-not-exist-in-1
$ hg ci -m third
$ rm does-not-exist-in-1
$ hg diff -r 1