Ignore fomantic folder in linters (#30200)

We are not linting these files but editor integrations will still try to
lint, disable that.

.eslintrc.yaml

@@ -3,6 +3,7 @@ reportUnusedDisableDirectives: true
 
 ignorePatterns:
   - /web_src/js/vendor
+  - /web_src/fomantic
 
 parserOptions:
   sourceType: module

stylelint.config.js

@@ -16,6 +16,7 @@ export default {
   ],
   ignoreFiles: [
     '**/*.go',
+    '/web_src/fomantic',
   ],
   overrides: [
     {