Add pre-push hook check to block leftover .only()s (#1189)

extensions/ql-vscode/package.json

@@ -1170,7 +1170,7 @@
   "husky": {
     "hooks": {
       "pre-commit": "npm run format-staged",
-      "pre-push": "npm run lint"
+      "pre-push": "npm run lint && scripts/forbid-mocha-only"
     }
   },
   "lint-staged": {

extensions/ql-vscode/scripts/forbid-mocha-only

@@ -0,0 +1,6 @@
+if grep -rq --include '*.test.ts' 'it.only\|describe.only' './test' './src'; then
+    echo 'There is a .only() in the tests. Please remove it.'
+    exit 1;
+else
+    exit 0;
+fi