EntityGenerator lifecycle event callbacks

[timum-viw]

Bug Report

Q	A
BC Break no
Version	2.20.x

Summary

The EntityGenrator creates invalid php when adding the same lifecycle event callback to two or more lifecycle events. The generator will create a stub for each event each with the same method name resulting in fatal 'Cannot redeclare' errors. That is, only if the callback name contains uppercase letters.

Current behavior

Multiple methods with the same name are generated resulting in fatal errors.

How to reproduce

I added test cases in my pr #11621 showcasing the behavior.
In any case this can easily be reproduced by adding a callback with a name containing uppercase letters to multiple lifecycle events.
When running the EntityGenerator invalid php is being generated..

Expected behavior

lifecycle event callbacks should be added only once with according annotations for multiple events.