[BUGFIX] Reset `window.opener` in backend and load modules if authenticated

This patch resets the `window.opener` for the entire TYPO3 backend and
loads modules using this only in an authenticated environment. This
solves an issue when `window.opener` is accessed and the login or
backend were opened from a link, e.g. the password reset mail.

Resolves: #91270
Resolves: #91205
Releases: master, 9.5
Change-Id: I83bdbfa7dfb80fbcd92ac4a000a6479aad22a73a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64394


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>