* pr/16327:
  Polish "Add Spring-specific styling to Gradle Plugin's documentation"
  Add Spring-specific styling to Gradle Plugin's documentation

Closes gh-16327

This commit replaces the default Asciidoctor styling with
Spring specific styling.

First, we need to unzip the contents of the Spring Asciidoctor
documentation resources provided by the
`io.spring.docsresources:spring-docs-resources` distribution zip. This
is done in a `/target/refdocs` folder. We then copy all files from
`src/main/asciidoc` to the same location, and then launch the generation
process.

See gh-16327

Closes gh-16326

Closes gh-16415

Closes gh-16413

See gh-16068

* gh-16410:
  Polish "Update CORS handling according to Framework changes"
  Update CORS handling according to Framework changes

Closes gh-16410

See gh-16410

This commit updates CORS handling according to Framework changes
introduced via [1]. It also fixes tests according to the new behavior.

See gh-16410

[1] https://github.com/spring-projects/spring-framework/commit/d27b5d0ab6e8b91a77e272ad57ae83c7d81d810b.

* gh-16087:
  Polish "Ensure that MongoClient's EventLoopGroup is shut down during context close"
  Ensure that MongoClient's EventLoopGroup is shut down during context close

Closes gh-16087

See gh-16087

See gh-16087

Closes gh-16189

Closes gh-16040

Closes gh-16068

Closes gh-16347

Closes gh-16346

Closes gh-16345

Closes gh-16360

Closes gh-16359

Closes gh-16358

Fixes gh-16177