Build form rename form

### Describe the feature you'd like to request

A way to rename a form in Amplify studio after the form has been created.

### Describe the solution you'd like

Click in the form name header (NewForm1) and edit the name of the form

### Describe alternatives you've considered

I have not been able to find a way to change the form name in Amplify Studio.

### Additional context

_No response_

Start in the Amplify Studio form editor at the form name header labeled NewForm1. Trace how an existing form's name is stored and displayed, then verify that editing the header persists after reopening the form.

Written by the indexing model from the issue text.