Selective Hazelcast support

[cdprete]

Hello.

Enhancement
To my understanding of the docs at https://docs.spring-boot-admin.com/3.5.5/docs/server/server#clustering and from trials I did in the past, to have Hazelcast clustering support in an SBA server, both the notification and event maps need to be configured, because otherwise it would crash (e.g.: #4258).
Given the weird behavior in #4599, which is not fixable if not by destroying the environment completely (on rolling updates / zero-downtime deployments, the event cache gets migrated from one old node to new one which is starting automatically), I would like to have the possibility to have only the notifications clustered - in order to avoid duplicates - and not the events as well.