RX Buffer unit test failed during one of my local debug runs. Unfornunately, I did not reporduce it, NOR backed-up the seeds. The aim of this task is to execute very intense RX Buffer unit test and make sure that it works properly. It might be useful to create PSL functional coverage statements first: https://gitlab.fel.cvut.cz/illeondr/CAN_FD_IP_Core/issues/201