Closes gh-12098

Refactor `ConfigurationPropertiesBindingPostProcessor` to allow JSR-303
validation on `@ConfigurationProperties` defined at the `@Bean` method
level.

JSR-303 validation is now applied when a JSR-303 implementation is
available and `@Validated` is present on either the configuration
properties class itself or the `@Bean` method that creates it.

Standard Spring validation is also supported using a validator bean
named `configurationPropertiesValidator`, or by having the configuration
properties implement `Validator`.

The commit also consolidates tests into a single location.

Fixes gh-10803

See gh-11758

This commit fixes two issues in `TestRestTemplate`:

* it improves the detection of the underlying request factory, using
reflection to look inside the intercepting request factory if
interceptors were configured

* it avoids reusing the same request factory when creating a new
`TestRestTemplate` with `withBasicAuth`. Sharing the same instance would
result in sharing authentication state (HTTP cookies). Since the
original request factory can't be detected consistently, a new one is
selected automatically

See gh-8697

Fixes gh-11758

Closes gh-12081

Closes gh-12094

* gh-12068:
  Polish "Add auto-configuraton for exporting metrics to Wavefront"
  Add auto-configuration for exporting metrics to Wavefront

Closes gh-12068

See gh-12068

Closes gh-11853

Closes gh-12080

Closes gh-11864

Update Redis Cache tests after changes in DATAREDIS-715.

Closes gh-11930

Previously `TestRestTemplate` would override the configured
`ClientHttpRequestFactory` if the Apache HTTP client library was on
classpath.

This commit fixes two issues:

1. The existing `ClientHttpRequestFactory` is overridden *only* if it is
using the Apache HTTP client variant, in order to wrap it with the
`TestRestTemplate` custom support

2. Calling `withBasicAuth` will no longer directly use the request
factory returned by the internal `RestTemplate`; if client interceptors
are configured, the request factory is wrapped with an
`InterceptingClientHttpRequestFactory`. If we don't unwrap it,
interceptors are copied/applied twice in the newly created
`TestRestTemplate` instance. For that, we need to use reflection as the
underlying request factory is not accessible directly.

Closes gh-8697

See gh-11870

Closes gh-12086

Closes gh-11916

* gh-12082:
  Use Jersey BOM in dependency management

Closes gh-12082

Closes gh-12065

* gh-12073:
  Polish "Add Kotlin support reference documentation"
  Add Kotlin support reference documentation

Closes gh-12073

See gh-12073

The `server.display-name` configuration property is used to configure
the application display name for Servlet-based applications.

This commit moves that property to:
`server.servlet.application-display-name` and keeps the same defaults.

Closes gh-8624

* gh-12070:
  Polish "Document git command to clone the repo on Windows"
  Document git command to clone the repo on Windows

See gh-12070

Closes gh-12070

This reverts commit 4179ed5a.

See gh-11870

Previously, we removed the Connectors from Tomcat's Service before
the Context was started. The removal of the Connectors is required as
it prevents Tomcat from accepting requests before we're ready to
handle them.

Part of starting the Context is creating and initializing the
ServletContext. ServerProperties uses a ServletContextInitializer to
set the session tracking modes and Tomcat rejects the SSL tracking
mode if there is no SSL-enabled connector available. With the previous
arrangement this led to a failure as the Connectors had been removed
so the SSL-enabled connector could not be found.

This commit updates the embedded Tomcat container to defer the
removal of the Connectors until after the context has been started
but still at a point that is before the Connectors themselves would
have been started.

Closes gh-12058