chore: Centralise ESLint rules (#2162)

* chore: centrilize eslint rules

packages/medusa-plugin-brightpearl/package.json

@@ -25,11 +25,9 @@
     "axios-mock-server": "^0.19.0",
     "client-sessions": "^0.8.0",
     "cross-env": "^7.0.2",
-    "eslint": "^6.8.0",
     "jest": "^25.5.2",
     "medusa-interfaces": "^1.3.1",
-    "medusa-test-utils": "^1.1.37",
-    "prettier": "^2.0.5"
+    "medusa-test-utils": "^1.1.37"
   },
   "scripts": {
     "build": "babel src -d . --ignore **/__tests__",