When having an extension loaded that specifies a cache
without a specific backend like ext:adminpanel, the caching
framework falls back to default Typo3DatabaseBackend.

The scheduler task "Caching framework garbage collection"
does not reflect this and renders an empty entry when no
specific backend is configured.

Fix this by adding the fallback to the tasks additional
field provider, too.

Resolves: #96504
Releases: main, 11.5
Change-Id: I985ff3b9888723986e7938238be99e45c1999064
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72961


Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>