[TASK] Remove deprecated stripTagsExcept from HtmlParser

Resolves: #56847
Releases: 6.2
Change-Id: I69ff622366a365305e68f858d0c18611a563595c
Reviewed-on: https://review.typo3.org/28325
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer