Text field max length is -1 by default

Steps to reproduce:

1. Create a new URP project.
2. Assets > Create > UI Toolkit > UI Document, open this in UI Builder.
3. Drag component Text into Hierarchy, and view it in the UI Builder Inspector. Note the Max Length Attribute.

Actual results: Max length is -1, but you can type in the field and the field will show text.

Expected results: Max length is greater than 0 and a feasible number for a text field. Note in U6 versions, numeric fields have their max length set to 1000.

Reproducible with versions: 6000.1.0a6, 6000.0.30f1, 2022.3.53f1, 2021.3.45f1

Tested on (OS): MacOS 12.7.6

Notes:

• Have not thoroughly regression tested this as it seems to be a new feature. Please contact the ticket reporter if regression testing will be useful.
• The text field seemed to fix itself after being reselected, but the numeric fields did not.