refactor(router): store `network_transaction_id` for `off_session` payments irrespective of the `is_connector_agnostic_mit_enabled` config (#7083)
Co-authored-by: Gnanasundari24 <118818938+Gnanasundari24@users.noreply.github.com>
Co-authored-by: Pa1NarK <69745008+pixincreate@users.noreply.github.com>