[TASK] Remove duplicated button in Edit File dialog

The button "save and close" is removed because
"save" button does exactly the same thing.
To streamline behavior the save button also
returns to edit file view instead of returning
file list view.

On top of that add a test to cover such redirect
issues in the future.

Resolves: #94481
Resolves: #91840
Releases: master
Change-Id: I5656cdbdc31444f632e05577c34cee50daed71e5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69717


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>