Rollup merge of #96835 - GuillaumeGomez:eslint-rules, r=notriddle

Add more eslint rules

Slowly continuing to enforce more rules with eslint.

Part of #93058.

r? `@notriddle`

Author: matthiaskrgr

src/librustdoc/html/static/.eslintrc.js

@@ -21,6 +21,11 @@ module.exports = {
             "error",
             "double"
         ],
+        "linebreak-style": [
+            "error",
+            "unix"
+        ],
+        "no-trailing-spaces": "error",
         "no-var": ["error"],
         "prefer-const": ["error"],
         "prefer-arrow-callback": ["error"],