feat(invoice generation): Sytem Creates invoice depending on a config

[kevel-dev]

@dragos-dobre We noticed that when assigning a policy, the system automatically generates an associated invoice. However, there are cases where this should no longer be necessary—for example, in Comoros, where invoices are already created based on their management policies.

To address this, we’ve added control over system-generated invoices via a configurable variable, which should help. By default, this setting remains enabled (true), meaning invoices will continue to be generated natively unless manually adjusted

[delcroip]

Thank you for raising that,
@mngoe @dragos-dobre I think we should remove that code all together, maybe to put it in the wiki as example for signal management, what do you think ?

[mngoe]

IMHO if we want to evolve from product attribution and replace it by contribution plan selection (and so invoice generation based on contribution plan) we should probably remove this native part of the code. Or at least disable it by default. @delcroip

[delcroip]

@kevel-dev can you simply remove the create invoice code / move it in the calcrule ?