Updating profiles metadata on every start of the application can be quite useless if no profile metadata has been changed.

It has a very small impact if the application uses few profiles, however when the application handles dozens of profiles it can DDOS the relays as the profiles update will be sent without any delay.

We should make the metadata optional and only execute it on demand.

For that we should add a flag on the core to enable profile update, and if not provided, not update the profile metadata.