[TASK] Remove window.open inline JavaScript in backend

To reduce the amount of inline JavaScript corresponding `window.open`
occurrences are removed from TYPO3 backend user interface:

* Backend Login refresh handling
  + tests checking for arbitrary inline JavaScript were removed
* ViewPage page preview
* FormEngine
  + "open in new window" button in top right bar
  + close behavior when editing form in new window

Resolves: #91815
Releases: master
Change-Id: I39c9c0350a0bdcf22b12bb6dba8fee8e9a03e315
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65050


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>