DEV: Move `eslint-config-discourse` to `devDependencies` (#19641)

package.json

@@ -14,7 +14,6 @@
     "chart.js": "3.5.1",
     "chartjs-plugin-datalabels": "^2.0.0",
     "diffhtml": "^1.0.0-beta.20",
-    "eslint-config-discourse": "^3.3.0",
     "magnific-popup": "1.1.0",
     "moment": "2.29.4",
     "moment-timezone": "0.5.39",
@@ -31,6 +30,7 @@
     "@mixer/parallel-prettier": "^2.0.3",
     "chrome-launcher": "^0.15.1",
     "chrome-remote-interface": "^0.31.3",
+    "eslint-config-discourse": "^3.3.0",
     "lefthook": "^1.2.0",
     "puppeteer-core": "^13.7.0"
   },