[BUGFIX] Remove invalid has-changed class on new records

We are removing the misused has-changed class for new
records and replacing it with a dedicated is-new class.
This class is used only to check if a record needs to be
persisted before certain actions, such as closing or
previewing a record, can be executed.

Resolves: #104690
Related: #87890
Related: #104676
Releases: main, 12.4
Change-Id: Ie0ddd119de860f9539acc9d1353428529afa7f83
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85975


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>