prevent test.only (#24235)

I almost checked in a change to disable all tests again. This will
prevent that

Author: amunger

.eslintrc

@@ -5,7 +5,10 @@
         "mocha": true
     },
     "parser": "@typescript-eslint/parser",
-    "plugins": ["@typescript-eslint"],
+    "plugins": [
+        "@typescript-eslint",
+        "no-only-tests"
+    ],
     "extends": [
         "airbnb",
         "plugin:@typescript-eslint/recommended",
@@ -97,6 +100,7 @@
             }
         ],
         "operator-assignment": "off",
-        "strict": "off"
+        "strict": "off",
+        "no-only-tests/no-only-tests": ["error", { "block": ["test", "suite"], "focus": ["only"] }]
     }
 }

package-lock.json

@@ -83,8 +83,7 @@
     "browser": "./dist/extension.browser.js",
     "l10n": "./l10n",
     "contributes": {
-        "problemMatchers":
-        [
+        "problemMatchers": [
             {
                 "name": "python",
                 "owner": "python",
@@ -98,7 +97,6 @@
                     },
                     {
                         "regexp": "^\\s*(.*)\\s*$"
-
                     },
                     {
                         "regexp": "^\\s*(.*Error.*)$",
@@ -1640,6 +1638,7 @@
         "eslint-config-prettier": "^8.3.0",
         "eslint-plugin-import": "^2.29.1",
         "eslint-plugin-jsx-a11y": "^6.3.1",
+        "eslint-plugin-no-only-tests": "^3.3.0",
         "eslint-plugin-react": "^7.20.3",
         "eslint-plugin-react-hooks": "^4.0.0",
         "expose-loader": "^3.1.0",