[vlm] fix loading of retrieval VLMs (#39242)
* fix vlm with retrieval
* we can't use AutoModel because new ColQwen was released after refactor
* no need for colqwen
* tied weight keys are necessary, if using IMageTextToText
* need to apply renaming in tied weights, only for ColPali
* overwrite tied keys in ColPali
* fix copies, modular can't handle if-statements
