Closes gh-22389

Closes gh-22511

Closes gh-22385

Closes gh-22390

Closes gh-22386

Closes gh-22387

Closes gh-22383

Closes gh-22507

See gh-22505

Closes gh-22388

Closes gh-22384

Closes gh-22382

* gh-22499:
  Add plugin management for liquibase-maven-plugin

Closes gh-22499

See gh-22499

Closes gh-22491

* gh-22488:
  Remove redundant compiler arguments in Gradle build files

Closes gh-22488

See gh-22488

Closes gh-22485

See gh-22107

Closes gh-22483

Prior to this commit, the application availability infrastructure
would mix the `AvailabilityState`, the `HealthIndicator` and the
`HealthGroup` concepts and would not align with the rest.

This commit auto-configures the livenessState and readinessState
health indicators with the relevant configuration properties.
Unlike other indicators, they are not enabled by default but might
be in future versions.

This also moves the `management.health.probes.enabled` property
to `management.endpoint.health.probes.enabled` since "probes" here
is not a health indicator but rather a configuration flag for the
health endpoint.

Finally, the probes auto-configuration is refined to automatically
add liveness and readiness indicators for the probes group if
they're not already present.

Closes gh-22107

Closes gh-22375