phabricator: include the suggested arc config in the repo
Test Plan: I uploaded this revision with `arc diff` Differential Revision: https://phab.mercurial-scm.org/D171
.arcconfig
0 → 100644
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This instance will be upgraded to Heptapod 17.9.0rc1 on 2025-03-27 between 17:00 and 18:00 UTC+2
Test Plan: I uploaded this revision with `arc diff` Differential Revision: https://phab.mercurial-scm.org/D171