Prior to this commit, we were relying on the
`"spring.main.cloud-platform"` property for overriding cloud platform
detection and enabling liveness and readiness probes. Changes made in
gh-20553 have now been reverted.

This commit adds the `"management.health.probes.enabled"` configuration
property. The auto-configuration now enables the HTTP Probes and
`HealthIndicator` if this property is enabled, or if the Kubernetes
cloud platform is detected.

This property is `false` by default for now, since enabling this for all
Spring Boot applications would be a breaking change. In this case, the
global `"/actuator/health"` endpoint could report `OUT_OF_SERVICE`
during startup time because the application now reports the readiness as
well.

See gh-19593

This reverts commit 4b7ed5ef.

See gh-20553

See gh-19593

Closes gh-20562

Closes gh-20539

Closes gh-20570

Closes gh-20569

Closes gh-20624

Closes gh-20622

Closes gh-20378

Closes gh-20621

* pr/20617:
  Polish "Fix @FlywayDataSource with multiple data sources"
  Fix @FlywayDataSource with multiple data sources

Closes gh-20617

See gh-20617

See gh-20617

Closes gh-20619

Closes gh-20618

Closes gh-19564

Closes gh-20616

Closes gh-20615

Previously, the presence of a `ConsumerFactory` bean would make the
auto-configured one to back off, leading to a failure down the line if
no available instance matches the generics criterion. This commit
improves the auto-configuration to create a `ConsumerFactory<?,?>`
behind the scenes if none is available.

Closes gh-19221

Closes gh-20613

See gh-20570

Closes gh-20612

* pr/20523:
  Polish "Configure signature algorithm when using public key jwt decoder"
  Configure signature algorithm when using public key jwt decoder

Closes gh-20523

See gh-20523

See gh-20523

* gh-20608:
  Fix "Building Docker Images" section level

Closes gh-20608

See gh-20608

Closes gh-20607

* pr/20604:
  Polish BindableTests

Closes gh-20604

See gh-20604

* pr/20601:
  Remove redundant MockitoAnnotations.initMocks()

Closes gh-20601

See gh-20601