[TASK] Improve form element header in form inspector

If a field contains a label that is too long, this creates an ugly line
break in the form element header. And also the label of the field is
displayed redundantly below the header. So we output the field type
instead of the label.

Resolves: #97488
Releases: main
Change-Id: Ia33b0b41697ecf4cb43bad51069596322fa4a704
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74489


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Steiger <typo3@andreassteiger.de>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: waldhacker <hello@waldhacker.dev>
Reviewed-by: Andreas Steiger <typo3@andreassteiger.de>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: waldhacker <hello@waldhacker.dev>