chore: remove temporary debug scripts

Removed `test_dialog.js`, `test_dialog.mjs`, and `test_dialog2.mjs` which were accidentally left in the workspace and caused `npm run check-format` to fail.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: Lightning00Blade