[TASK] EXT: lowlevel Configuration labels

Configuration arrays should be accessed via $GLOBALS.
Modify labels to include the $GLOBALS keyword.

Change-Id: Iea3255e8ebcbf5bd23400fe4d597ea5eca421025
Resolves: #55324
Releases: 6.2
Reviewed-on: https://review.typo3.org/27055
Reviewed-by: Marcin Sągol
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters