Fix: Disable image upload functionality for models which don't support multimodality

[alashchev17]

Fix: Disable image upload functionality for models which don't support multimodality

Description

• If current model doesn't support multimodality, all attached files (if any) get removed, image attach button disappears and drag&drop functionality stops
• P1 - UI - disable image upload for models that don't support multimodality

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes, only code improvements)
• Documentation update

Checklist

• My code follows the code style of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.
• I have updated the documentation where necessary.