fix(core): Respect user's .gitignore preference (#15482)

Co-authored-by: Gaurav <39389231+gsquared94@users.noreply.github.com>

integration-tests/ripgrep-real.test.ts

@@ -28,6 +28,10 @@ class MockConfig {
     return true;
   }
 
+  getFileFilteringRespectGitIgnore() {
+    return true;
+  }
+
   getFileFilteringRespectGeminiIgnore() {
     return true;
   }