V24: ensure dev bundle isn't included in add-on

[OlliTietavainenVaadin]

Describe your motivation
V24 add-on skeleton shouldn't generate a dev bundle because it's not an application, it's an add-on
Describe the solution you'd like
Do not generate dev bundle
Describe alternatives you've considered

[Legioth]

It might be fine that a bundle is created since it helps speed up development of the add-on itself.

We should just make sure that the bundle is not included in the stuff that would be uploaded to Directory. It might potentially works in that way automatically since it might only pick sources from e.g. src/main/java and not from src/main/dev-bundle (I haven't tested).

[Artur-]

The files in src/main/dev-bundle are never included in a jar or war

[mshabarov]

Can we close this issue or do we expect something to be fixed in Flow? I don't see what we should do/fix.

[mshabarov]

We don't have a branch for V24 by the way. I'll make a ticket.