add multiline prop to text field

[helihard]

Description

This PR changes the survey text block 'Description' from a single-line input to multiline.

Screenshots

Changes

• Adds the multiline prop to the ZUIPreviewableInput TextField component for content inputs.

Notes to reviewer

When navigating the Survey area, I noted that the 'Description' block for Open Question and Choice Question were also single-line, making them equally hard to navigate in edit mode. My proposed solution targets the 'Description' block for all three question types. If this is an incorrect approach, I can continue working with the issue.

Related issues

Resolves #2465

[richardolsson]

Love it! It's such a simple solution and I think it's an improvement to all of the affected fields.

I know at least one organizer who will love that we're getting this into the next release.