[BUGFIX] Fix behaviour when dragging a content in the page module

The drop zones added space when they appear during a drag and drop
action and it changed the mouse position. Also each content had a
“new content” button relative to it and this button was dragged
with it. This fixes both problems.

Resolves: #95231
Releases: master
Change-Id: I03f2219726ce1b7563409198449ed20dfc681a7e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71105


Tested-by: core-ci <typo3@b13.com>
Tested-by: Jonas Eberle <flightvision@googlemail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Jonas Eberle <flightvision@googlemail.com>
Reviewed-by: Benni Mack <benni@typo3.org>