add file-casing test repo to rewatch tests

Author: tsnobip

rewatch/testrepo/package.json

@@ -11,7 +11,8 @@
       "packages/with-dev-deps",
       "packages/compiled-by-legacy",
       "packages/nonexisting-dev-files",
-      "packages/deprecated-config"
+      "packages/deprecated-config",
+      "packages/file-casing"
     ]
   },
   "dependencies": {

rewatch/testrepo/rescript.json

@@ -23,6 +23,7 @@
     "@testrepo/with-dev-deps",
     "@testrepo/compiled-by-legacy",
     "@testrepo/nonexisting-dev-files",
-    "@testrepo/deprecated-config"
+    "@testrepo/deprecated-config",
+    "@testrepo/file-casing"
   ]
 }