Closes gh-8333

Previously, the custom layout sample could only be built successfully
if spring-boot-dependencies had be installed locally, making its
effective pom available in the local Maven cache.

This commit updates the sample's tests to look at its own pom to
determine the version of Spring Boot that should be used in the
Gradle tests.

Closes gh-8330

* pr/8273:
  Fix version of `gradle-git-properties` in doc

Closes gh-8273

* pr/8319:
  Fix audit events related documentation

Closes gh-8319

Previously, bootRepackage's excludeDevtools property would be
overridden by the springBoot extension's excludeDevtools property.
This prevented devtools from being included by configuring it on the
repackaging task.

This commit corrects the logic so that the setting on the repackaging
task takes priority. It also adds some tests to verify the behaviour.

Closes gh-8308

Closes gh-8305

If `jwk.key-set-uri` is present.

Closes gh-4437

Closes gh-8304

* pr/8300:
  Fix a broken AsciiDoc attribute declaration

Closes gh-8300

This commit also removes the exclusion of cdi-api. It is no longer
required as https://hibernate.atlassian.net/browse/HHH-11370 has been
fixed in 5.2.7.

Closes gh-8111

Closes gh-8249

Closes gh-8288

Closes gh-8289

The Servlet spec states that the default is REQUEST. This commit
aligns Spring Boot with that default.

Closes gh-7467

Closes gh-8287

Closes gh-8253

This commit adds `EmbeddedWebServerInitializedEvent`, which holds the
`EmbeddedWebServer` information when the application context starts.
The `EmbeddedServletContainerInitializedEvent` now inherits from that
type and holds additional information, the
`EmbeddedWebApplicationContext`.

Closes gh-8208

Closes gh-8192

* gh-8263:
  Tests that lists of lists are sanitized correctly
  Ensure that entries in a list of lists are not lost during sanitization

See gh-8263

Closes gh-8263
See gh-8197

Closes gh-8280