[TASK] Doctrine: Migrate ExtensionService

Resolves: #76528
Releases: master
Change-Id: I34e9fb0b3bb4bf3e55b3dc43d6358ce3113d5df5
Reviewed-on: https://review.typo3.org/48513


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Susanne Moog <typo3@susannemoog.de>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>