[BUGFIX] ckeditor: propagate changes in editor document

If the document model in a ckeditor instance is changed, the changes are
now immediately written back to the related source element and a
`change` event is dispatched, recovering the modal window when closing
the FormEngine.

Resolves: #98717
Releases: main
Change-Id: If605018a2c11e6448900639b2b8fd0fa5d0f4c2b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78322


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>