[BUGFIX] Allow links in sys_news

Rendering links set for sys_news (shown at backend
login) records via RTE does not work.

Reason is a nasty dependency to TypoScript
lib.parsefunc, which isn't easy to retrieve
in BE scope.

With recent RTE html parser related changes,
it's now relatively easy to submit a fallback
layer in case for instance f:html view helper
isn't used within FE context.

Resolves: #67556
Releases: master
Change-Id: I7d6226bd998396a1d3859cbf956f9d5d61bed7d4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70740


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>