[TASK] Clean up uses of fe_adminLib properties

Two Core tables (fe_users and index_config) still use the
"fe_admin_fieldList" property, which has no effect on the
Core since the fe_adminLib.inc was moved out of it
(into the statictemplates extension).

Additionally a deprecation message is logged in method
ExtensionManagementUtility::addTCAcolumns() when the $addTofeInterface
argument is set to TRUE.

Resolves: #54613
Releases: 6.2
Change-Id: I7c9961c5e92411a78bd355519a0493eb695177e7
Reviewed-on: https://review.typo3.org/26567
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Oliver Klee
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Francois Suter
Tested-by: Francois Suter