[!!!][TASK] Remove deprecated DocumentTemplate classes

* MediumDocumentTemplate
* SmallDocumentTemplate
* StandardDocumentTemplate

Resolves: #61782
Releases: master
Change-Id: I9ccc81e1d62f6e662e356b584eb2db61eea55016
Reviewed-on: http://review.typo3.org/32906
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>