Clean up lint rules (#30721)

* Remove unneeded rule suppression
* Format tests/unit/.eslintrc.json
* build/.eslintrc.json: add strict for consistency

build/.eslintrc.json

@@ -8,6 +8,7 @@
   },
   "extends": "../.eslintrc.json",
   "rules": {
-    "no-console": "off"
+    "no-console": "off",
+    "strict": "error"
   }
 }

js/tests/unit/.eslintrc.json

@@ -5,7 +5,9 @@
   ],
   "overrides": [
     {
-      "files": ["**/*.spec.js"],
+      "files": [
+        "**/*.spec.js"
+      ],
       "env": {
         "jasmine": true
       }

site/.eslintrc.json

@@ -33,7 +33,6 @@
       "never"
     ],
     "strict": "error",
-    "unicorn/consistent-function-scoping": "off",
     "unicorn/no-for-loop": "off",
     "unicorn/no-null": "off",
     "unicorn/prefer-dataset": "off",