See gh-17274

Add `@WebServiceClientTest` and related test auto-configuration to allow
slice testing of Spring Web Service client applications.

See gh-17274

Closes gh-21448

Closes gh-21447

Closes gh-21446

Closes gh-21385

Closes gh-21386

Closes gh-21444

Update `EndpointDiscoverer` so that `@Endpoint` and `@EndpointExtension`
beans are created as late as possible.

Prior to this commit, endpoint beans and extension beans would be
created during the discovery phase which could cause early bean
initialization. The problem was especially nasty when using an embedded
servlet container since `ServletEndpointRegistrar` is loaded as the
container is initialized. This would trigger discovery and load all
endpoint beans, including the health endpoint, and all health indicator
beans.

Fixes gh-20714

Closes gh-21353

This reverts commit 7b790299.

See gh-21375

Closes gh-21387

Restore the `getUseRelativeRedirects` method with a `Boolean` object
result and introduce `isUseRelativeRedirects` for the primitive boolean
variant.

See gh-20796

Closes gh-21419

Closes gh-21221

Closes gh-20517

* pr/21378:
  Upgrade to Testcontainers 1.14.1

Closes gh-21378

See gh-21378

Gradle's metadata for a platform does not provide a way to define
exclusions in the same way that can be done in <dependencyManagement>
in a Mavne bom. This means that Gradle 6 users lose the exclusions
that are defined in the pom as Gradle 6 will use the metadata rather
than the pom.

Until such a time as Gradle's metadata supports the configuration of
such exclusions we can avoid the problem by disabling the metadata's
publication.

Fixes gh-21350

See gh-21437

This commit expands the migration check to all deprecated properties,
not only the ones that have been effectively removed. This provides more
information upfront, including keys that still work in the current
release but will need to be renamed sooner than later anyway.

Closes gh-21425

See gh-20934

Further improve the performance of `containsDescendantOf` by using
a Map to limit the number of candidates that need checking.

Closes gh-21416

Attempt to improve the performance of the `ConfigurationPropertySource`
adapters `containsDescendantOf` method. The method now operates on
arrays rather than iterators and reduces the inner for-loop when
possible.

See gh-21416

Closes gh-20934

5 seconds isn't always sufficient, particularly on CI where the timing
can be quite variable.

Prior to this commit, if a DOCKER_HOST environment variable was present
when attempting to communicate with a Docker daemon, it was assumed
that the value of that variable was an address that could be used to
create an HTTP connection to a remote daemon. In some cases, the value
of the variable is the path to a local socket file, which would cause
the HTTP connection to fail.

This commit adds additional validation of the value of the DOCKER_HOST
environment variable to determine whether it is a remote address or
a local socket file and create the appropriate connection type.

Fixes gh-21173

Previously, a race between the server starting to reject requests
on a kept-alive connection and the request reaching the blocking
servlet could result in a response never being sent.

This commit updates the test to disable blocking once graceful
shutdown with an in-flight request has being. Awaitility is then used
to make a request on an idle kept-alive connection until it fails
due to the connection reset. This may not happen immediately due to
the aforementioned race.

Closes gh-21429

Closes gh-21375

Closes gh-21347