UI Toolkit Elements can be renamed to special characters when renaming through Inspector in UI/main stage

Steps to reproduce:

1. Create and open a new project
2. In Hierarchy, 'Right-click -> UI Toolkit -> Standard Elements -> Visual Element'
3. Select the Visual Element in UI/main stage
4. Press F2 to rename the Visual Element
5. Try naming it to "!@#$" (fails, reverts to previous value)
6. In Inspector, rename it to "!@#$" and observe the Hierarchy

Actual results: The Visual Element is named to "!@#$"

Expected results: The Visual Element name is reverted to the previous value 

Reproducible with versions: 6000.6.0b1, 6000.6.1f1, 6000.7.0a6

Can’t test with versions: 6000.0.82f1, 6000.3.23f1, 6000.5.11f1, 6000.6.0a7 (No UI stage in Hierarchy)

Tested on (OS): Windows 11 Pro (25H2)

Notes:

• Does not reproduce in UI Builder
• This bug could cause problems with parsing element names in scripts