[TASK] Detect inject methods more strictly

Bugport from Flow https://review.typo3.org/#/c/13566/.
It checks method name to prevent using for example injectingFoo.

Change-Id: I5a70c3b21682143cd515bb2fe9ca03618bf834d4
Resolves: #40337
Releases: 6.1
Reviewed-on: https://review.typo3.org/16511
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring