Add "project" in arcconfig

.arcconfig

 {
   "phabricator.uri": "https:\/\/phabricator.apertis.org\/",
-  "lint.engine": "ArcanistConfigurationDrivenLintEngine"
+  "lint.engine": "ArcanistConfigurationDrivenLintEngine",
+  "project": "apertis-tests"
 }