Certain roles shouldn't be able to create a store

[pavlenex]

Currently, no matter the role, every user can create a store within BTCPay Server, I think we need to reconsider that at some point.

@ndeet mentioned at some point that @Kukks told at a dev call that this is a limitation that should be addressed, but there was a technical reason (that I am unfamiliar with) on why it may not be easy.

Logging this one for future releases and something that may be relevant as we restructure roles.

@dennisreimann unsure how this plays out with recent role refactoring.

[dennisreimann]

unsure how this plays out with recent role refactoring.

On #5719 it is still possible for everyone to create a store, but I think it would make sense to restrict that ability to the Owner role only. We can change this once #5782 is integrated.

[dstrukt]

ACK to restricting to the Owner role!

[TChukwuleta]

Hello.

Was looking at this issue. Since we are restricting role creation to owners role, was just thinking that it is just safe to not allow deletion of the owners role, as we do with all roles. What do you guys think?