[TASK] Replace last occurrences of DocumentTemplate::header

As the classes using the mentioned method don't use any templating,
replace the occurrences of the method with inline HTML.

Resolves: #72771
Releases: master
Change-Id: Ife88cd5ff942044037bb0d06678121b9e1490fff
Reviewed-on: https://review.typo3.org/46018


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>