Why override when you can fix in `Mixin` (#49105)
* why override when you can
* more models with same override
* same for quant cache tests
* it doesn't even exist in mixin
* and this one
* fix?
* found old fixme for myself
* comments and some flakiness
* and more flakiness, fix the root cause
* yeah, forgot it is more weird than simple VLMs
* flakiness is gone, and mra is weird
* codestyle
* remove from mxin
