Fix: Make textarea fill the area available instead of being resizable. (#6190)

## Summary

Invert the sizing of textareas. They now grow based on the container
instead of being independently resizable.

## Review Focus

Tested the behavior in Note, Markdown Note, CLIP Text Encode, and
Subgrpahs with promoted mutliline text widgets.

Anything else that might break with this?

## Screenshots (if applicable)


https://github.com/user-attachments/assets/4e2da142-d0b7-4629-9814-b637566ac1d6


<!-- Add screenshots or video recording to help explain your changes -->

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6190-Fix-Make-textarea-fill-the-area-available-instead-of-being-resizable-2946d73d3650818a9f77c619deb93d0b)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <[email protected]>

Author: DrJKL