fix(linter): fixes usages of lintProjectGenerator without eslintFileP…

…atterns provided

Previous change broke usages of the lintProjectGenerator which did not include an eslintFilePatterns
array option. This resolves by first checking for the arrays existence before pushing to it

closed #18740

packages/linter/src/generators/lint-project/lint-project.ts

@@ -50,7 +50,7 @@ export async function lintProjectGenerator(
   });
   const projectConfig = readProjectConfiguration(tree, options.project);
 
-  const lintFilePatterns = options.eslintFilePatterns;
+  const lintFilePatterns = options.eslintFilePatterns ?? [];
   if (isBuildableLibraryProject(projectConfig)) {
     lintFilePatterns.push(`${projectConfig.root}/package.json`);
   }