Disable modifier-name-case for gjs/gts (#2982)

lib/config/recommended.js

@@ -109,6 +109,14 @@ export default {
         // in strict mode -- there is no implicit this ever)
         'no-curly-component-invocation': 'off',
         'no-implicit-this': 'off',
+
+        // This rule is not enabled here (but it is enabled in the "stylistic" preset). However, the rule is
+        // essentially malfunctioning in gjs/gts context, so it makes sense to always add this override to
+        // disable it for gjs/gts files, in case the rule is enabled. Ideally, a better fix would be to give
+        // the rule enough information to determine the context, so it can disable itself, but that would
+        // require a bigger overhaul. In the meantime, this will prevent a broken experience for <template>
+        // tags. See https://github.com/ember-template-lint/ember-template-lint/issues/2436.
+        'modifier-name-case': 'off',
       },
     },
   ],