The old mobile testing suite has been removed because those tests have been migrated to the newer testing system. This reduces maintenance overhead and keeps the testing setup simpler without changing user-facing behavior.

Because all mobile tests are now converted to hoot. We decided to remove the `web.qunit_mobile_suite` QUnit suite.

task-4028335

The Belgian salary package configuration was cleaned up by removing an old field that is no longer used. This reduces maintenance overhead without changing the employee-facing salary offer process.

Since the field new_car is now used as show_new_car was, the field show_new_car is not used anymore and can be removed.