[TASK] Get rid of deprecated TBE_EDITOR.fieldChanged invocation

Substitutes deprecated invocation of `TBE_EDITOR.fieldChanged`.
Relevant processing has been duplicated from `TBE_EDITOR` to
corresponding `FormEngine` event handler. Throwing a new `change`
event from a `change` event handler is counterproductive and would
lead to an endless loop.

Resolves: #95352
Releases: master
Change-Id: I61daee4457ec5d2bb36d1bcc773178c25e00cb8e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71229


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>