See gh-6313

Closes gh-25106

A change [1] in Spring Framework 5.3 means that getUrl() on a
RequestEntity will throw an UnsupportedOperationException if the
entity was created using a template.

This commit updates TestRestTemplate to check for instances of
UriTemplateRequestEntity and to resolve the URI using the
entity's UriTemplateHandler instead of calling getUrl() directly.

Fixes gh-25097

[1] https://github.com/spring-projects/spring-framework/commit/a0f4d81db76cb100b8f0da3a3cc8a945a012a2c0

Closes gh-25103

See gh-6313

Add additional dependencies useful for the example code.

See gh-6313

Update the documented application output based on the latest version.

Add `pending-extract=true` to source blocks to help us identify
those that need to be extracted to a real source file.

See gh-6313

See gh-25089

Refine the package restructure started in 91ccc234 to help provide
a solid foundation for code snippets. This commit renames many of the
classes so that they no longer end in `Example`. It also removes some
of the inner types that were previously used. Many tag comments have
also been moved to ensure that `import` statements are available in
the docs.

Closes gh-25089

Restructure the packages in `spring-boot-docs` so that they mirror
the documentation sections. There are now three main packages:
`springbootfeatures`, `productionreadyfeatures` and `howto`. Each
of the main packages has a subpackage named after the section headings.

Example code now uses consistent `// tag::` names and imports are
applied using `[tag=*]` whenever possible.

Test snippets have been moved to `src/main/java` so that only a single
import attribute needs to be defined.

Closes gh-25089

See gh-25077

See gh-25076

Closes gh-25074

Update `WarIntegrationTests` do deal with a SNAPSHOT Spring Framwork
dependency.

See gh-23936

Update `spring-boot-maven-plugin` `settings.xml` so that milestone and
snapshot dependencies can be resolved.

See gh-23936

See gh-23936

Closes gh-25079

Closes gh-25078

Use the dependencies BOM to ensure versions used in the `MavenBuild`
test class are always aligned.

Closes gh-23936

Closes gh-25077

Closes gh-25076

Update `build.gradle` files to ensure that `junit-platform-launcher` is
a `testRuntimeOnly` dependency. This ensures that tests can be run from
Eclipse.

Closes gh-25074

Closes gh-22821
Closes gh-22195

See gh-22195

Closes gh-25073

Closes gh-25072

Fixes gh-24149

Closes gh-25067

Closes gh-25066

Since 2.3.8 and 2.4.2 the format includes the directory.

Closes gh-24856

Closes gh-25065