Is it permissible for the Saudi researcher to take the research stipend and have his name placed on the research paper, knowing that he did no work on the research, while the foreign researcher is the one who did all the work, and is she entitled to take her stipend and the stipend of the Saudi researcher?

The research must be attributed to its author, and it is not permissible to attribute it to someone else, as that is a lie, a falsehood, and an infringement on the researcher's right. The university reward is deserved by the one who fulfilled his duty in the research, and whoever did not fulfill it, it is not lawful for him, and he must return it to the university.