[siglip] fix pooling comment (#39378)
* feat(siglip2): add forward pass with pooled output logic in Siglip2TextModel
* test(siglip2): add test_text_model.py to verify pooled output behavior
* style(siglip2): fix formatting in test_text_model.py using Ruff
* fix(siglip2): remove misleading 'sticky EOS' comment and sync modular-classic files
* fix(siglip2): remove misleading 'sticky EOS' comment and sync modular-classic files
* chore(siglip2): regenerate classic model after modular change
* Update
