Restrict AdminClient permission for KafkaHealthIndicator

[guillermocalvo]

Closes #423

[sdelamo]

instead of adding a new configuration could we use the already existing Endpoint Sensitivity
and the settingendpoints.health.details.visible.

[guillermocalvo]

instead of adding a new configuration could we use the already existing Endpoint Sensitivity and the settingendpoints.health.details.visible.

Yeah I can use details.visible instead. However, I think it could be a bit confusing to the user if a simple matter of displaying/hiding details (as "visible" suggests) ends up having other implications: the restricted version doesn't take into account the configured replication factor (it just checks that it can connect to some node in the cluster).

As for the sensitive flag, I don't think I understand how you'd like to use it to control which one of the two versions should be enabled. As far as I understand, endpoint sensitivity determines who can access the endpoint, not what the endpoint should be doing.

@sdelamo Could you please elaborate on what your preferred solution would be? Thank you!

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