[VLMs] support passing embeds along with pixels (#38467)
* VLMs can work with embeds now
* update more models
* fix tests
* fix copies
* fixup
* fix
* style
* unskip tests
* fix copies
* fix tests
* style
* omni modality models
* qwen models had extra indentation
* fix some other tests
* fix copies
* fix test last time
* unrelated changes revert
* we can't rely only on embeds
* delete file
* de-flake mistral3
* fix qwen models
* fix style
* fix tests
* fix copies
* deflake the test
* modular reverted by fixes, fix again
* flaky test, overwritten
* fix copies
* style
