[!!!][TASK] Remove global option "lockBeUserToDBmounts"

The global configuration option, which is always active by
default, restricts ALL non-administrators to be locked in to
their webroots (DB mounts).

Disabling this option would allow any editor to see the whole
page tree, overriding most of the concepts used in TYPO3
Backend and permission handling.

As stated in the description of the option, it is highly
recommended for security reasons to leave this option enabled.

This option is removed to streamline TYPO3's permission handling.

Resolves: #92940
Releases: master
Change-Id: I15f6538bdb34077a99cb8d2db7a21e60492bb923
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66908


Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>