[!!!][TASK] Remove deprecated autocomplete widget

The Fluid widget <f:widget.autocomplete> has been deprecated in TYPO3
10 and is now removed without any replacement.

Releases: master
Resolves: #91439
Relates: #90856
Change-Id: I20b7ee0f5519ee5b8a8b6cee96c774bc06044ff8
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64521


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: TYPO3com <noreply@typo3.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>