Upgrade quarkus to 3.15

[carlesarnal]

This PR upgrades Quarkus with the following additions:

• We get back to use the datasources created by Quarkus, so any other jdbc property can be configured using standard Quarkus config values.
• The appropriate datasource is activated at application startup, using the configured storage.
• It keeps the existing properties for configuring the Apicurio datasource for backwards compatibility, so we technically have two different ways of configuring the same thing, using the apicurio property and using the quarkus one (just one documented). The Apicurio property could be removed, but that would be a breaking change.