[TASK] Doctrine: Migrate TemplateService

Resolves: #77478
Releases: master
Change-Id: Ia5be69a554ec890db9d7607841f3550d976b7dcc
Reviewed-on: https://review.typo3.org/49451


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>