Closes gh-19554

Closes gh-19553

Fixes gh-19552

Prior to this commit, the `ErrorController` would override the original
error response status if the error map cannot be written due to content
negotiation with the HTTP client. In that case, the error handling
infrastructure returns a `406 Not Acceptable` response.

This commit improves the `ErrorController` so that
`HttpMediaTypeNotAcceptableException` instances thrown by that
controller are not returned as is but instead we write the error
response with an empty body and the original HTTP error status.

Fixes gh-19545
See gh-19522

This commit allows to customize the default BeanNameGenerator for
scanned components using @SpringBootApplication.

Closes gh-19346

Closes gh-19542

* pr/19536:
  Remove deprecated usage of WebTestClientBuilderCustomizer

Closes gh-19536

See gh-19536

* pr/19511:
  Polish "Add Java 14 to JavaVersion enumeration"
  Add Java 14 to JavaVersion enumeration

Closes gh-19511

See gh-19511

See gh-19511

Closes gh-19535

* pr/19521:
  Improve Spring MVC auto-configuration section

Closes gh-19521

See gh-19521

Closes gh-19533

Closes gh-19532

* pr/19523:
  Upgrade CI to Artifactory Resource 0.0.10

Closes gh-19523

See gh-19523

Closes gh-19529

Prior to this commit, there was no distinction between explicitly setting
forward headers strategy to a value of NONE and not setting it at all.
This meant that in a cloud environment, a cloud provider was always checked
to see if it was active and using forward headers and there was no way to
prevent that.

This commit changes the default value of the property to null so that there
is a way to determine if the property was explicitly set to NONE.

Fixes gh-19333

Closes gh-19527

Closes gh-19526

This commit also changes the spring framework version
to use snapshots.

Closes gh-18767

Prior to this commit, the `ErrorController` would override the original
error response status if the error map cannot be written due to content
negotiation with the HTTP client. In that case, the error handling
infrastructure returns a `406 Not Acceptable` response.

This commit improves the `ErrorController` so that
`HttpMediaTypeNotAcceptableException` instances thrown by that
controller are not returned as is but instead we write the error
response with an empty body and the original HTTP error status.

Fixes gh-19522

Closes gh-19517

Prior to this commit, the Couchbase auto-configuration would use the
bucket credentials when RBAC is configured. This commit ensures that
RBAC is used in that case.

This commit also adds new configuration properties to customize the
bootstrap ports for Couchbase:

* `spring.couchbase.env.bootstrap.http-direct-port`
* `spring.couchbase.env.bootstrap.http-ssl-port`

Fixes gh-19393

Closes gh-19516

Closes gh-19515

* pr/19510:
  Update some copyrights to 2020

Closes gh-19510

See gh-19510

Closes gh-19509

* pr/19508:
  Add reference to OptaPlanner starter

Closes gh-19508

See gh-19508

Closes gh-19504

* pr/19503:
  Polish "Fix outdated reference in ArtemisConfigurationCustomizer javadoc"
  Fix outdated reference in ArtemisConfigurationCustomizer javadoc

Closes gh-19503

See gh-19503

See gh-19503