Previously, the default Logback configuration set the console
appenders charset to UTF-8. This was inconsistent with the Logback
file appender and Log4j2's console and file appenders, all of which
used the platform's default.

This commit removes the configuration of the Logback console
appender's charset. This means that it will use the platform's
default charset, aligning it with the Logback file appender and
both Log4j2 appenders.

Closes gh-11611

Previously, the ServletContext was configured after any
ServletContextInitializer beans had been initialized. This meant that
any configuration class that provided such a bean would be initialized
before the ServletContext was configured. If the configuration class
used the ServletContext in its initializtaion that it would see it in
its default, unconfigured state.

This commit reworks the configuration of the ServletContext so that
it happens before any ServletContextInitializer beans are initialized.

Closes gh-10699

Closes gh-11658

* pr/11621:
  Polish "Add test to spring-boot-sample-quartz"
  Add test to spring-boot-sample-quartz

Closes gh-11621

See gh-11621

* pr/11655:
  Polish

Closes gh-11655

* pr/11624:
  Polish "Fix potential resource leaks"
  Fix potential resource leaks

Closes gh-11624

See gh-11624

* pr/11648:
  Fix a wrong import for SocketChannel

Closes gh-11648

* pr/11649:
  Upgrade to JUnit Jupiter 5.0.3

Closes gh-11649

This commit makes sure that the `type` of a property is generated
property if the getter of the property is annotated. Previously, a type
implementation may expose the annotation information.

Closes gh-11512

This commit removes the use of the incubating PropertyState and
Provider API that was introduced in Gradle 4.0 and deprecated in
Gradle 4.3. A not-deprecated-but-still-incubating replacement was
introduced in Gradle 4.3. The short life of PropertyState and Provider
has made me wary of using an incubating Gradle API in our public API
as it may not be stable for long. Therefore, this commit does not move
to the replacement as it is incubating. Instead, it falls back to
using Gradle's convention mapping. This is internal API, but its use
is not part of our public API and I perceive the risk of using it to
be lower than using the deprecated and/or incubating API alternatives.

Closes gh-11640

Closes gh-11654

Closes gh-11059

Improve the structure of the response and include mappings from
WebFlux and Servlet and Filter registrations in addition to the
mappings from Spring MVC.

Closes gh-9979

This commit uses HTML escaping to sanitize error inputs that are
displayed in the default reactive HTML error view.

Fixes gh-11582

This commit adds support for HTTP compression with reactive servers,
with the following exceptions:

* `server.compression.mime-types` and
`server.compression.exclude-user-agents` are not supported by Reactor
Netty at the moment

* `server.compression.min-response-size` is only supported by Reactor
Netty right now, since other implementations rely on the
`"Content-Length"` HTTP response header to measure the response size
and most reactive responses are using `"Transfer-Encoding: chunked"`.

Closes gh-10782

Closes gh-11641

This commit moves "spring.mvc.media-types" to the
"spring.mvc.content-negotiation.*" namespaces introduced in gh-11105.

Closes gh-11636

The behaviour was changed in 2b99962a. This commit updates the
javadoc to hopefully clarify that Instant.isAfter(Instant) is used.

Closes gh-11612

This commit improves a class condition check on the actual
implementation rather than the general purpose interface.

Closes gh-11608

Previously, a number of Actuator endpoints ignored a context hierarchy
or assumed that it would always be linear. This commit reworks the
affected endpoints so that the no longer assume a linear hierarchy.

A side-effect of a non-linear hierarchy is that there may be multiple
different beans with the same name (in a linear hierarchy, a bean
with the same name as one in an ancestor context, replaces that bean).
The affected endpoints have also been updated so that, when bean names
are used as keys, those keys are grouped by application context. This
prevents a bean in one context from accidentially overwriting a bean
in another context.

Closes gh-11019

* pr/11604:
  Improve Kotlin extensions doc about type erasure

Since type erasure can be fixed only when using
ParameterizedTypeReference based Java methods, TestRestTemplate
API documentation should be updated to specify which extensions
are subject to type erasure, and which are not.

Closes gh-11604

Closes gh-11511