Prior to this commit, the livenessState and readinessState health
indicators would not be configured automatically and would be missing
from the "liveness" and "readiness" health groups, leading to 404s when
hitting the `/actuator/health/liveness` or `/actuator/health/readiness`.

This commit ensures that the health indicators beans have the proper
name and revisits the auto-configuration conditions to reflect that as
well.

Fixes gh-22562