fix(linter): rename languageSettings to languageOptions for flat config migration (#22924)

(cherry picked from commit 7561e71)

Author: pumano

packages/eslint/src/generators/convert-to-flat-config/generator.spec.ts

@@ -555,7 +555,7 @@ describe('convert-to-flat-config generator', () => {
         {
           files: ['**/*.ts', '**/*.tsx', '**/*.js', '**/*.jsx'],
           rules: {},
-          languageSettings: {
+          languageOptions: {
             parserOptions: { project: ['apps/dx-assets-ui/tsconfig.*?.json'] },
           },
         },

packages/eslint/src/generators/utils/flat-config/ast-utils.ts

@@ -768,7 +768,7 @@ export function generateFlatOverride(
   ) {
     if (override.parserOptions) {
       const { parserOptions, ...rest } = override;
-      return generateAst({ ...rest, languageSettings: { parserOptions } });
+      return generateAst({ ...rest, languageOptions: { parserOptions } });
     }
     return generateAst(override);
   }
@@ -800,7 +800,7 @@ export function generateFlatOverride(
   );
 
   if (parserOptions) {
-    addTSObjectProperty(objectLiteralElements, 'languageSettings', {
+    addTSObjectProperty(objectLiteralElements, 'languageOptions', {
       parserOptions,
     });
   }