Feature: #97664 - Add search functionality to form manager

See forge#97664

Description

Once there are numerous form definitions in the system, it can become difficult for an editor to find the correct form definition to edit. To make it easier, a search field is displayed in the form manager. This allows a case-insensitive search by name or persistenceIdentifier.

Impact

It's now possible to search for a form definition inside the form manager backend module.