See gh-18612

Closes gh-18607

See gh-18229

* pr/18581:
  Polish "Add metadata entry for spring.main.register-shutdown-hook"
  Add metadata entry for spring.main.register-shutdown-hook

Closes gh-18581

See gh-18581

See gh-18581

* pr/18578:
  Polish "Clarify formatting recommendations for configuration property javadoc"
  Clarify formatting recommendations for configuration property javadoc

Closes gh-18578

See gh-18578

This commit adds a note to spring-boot-features.adoc to clarify that
using javadoc tags to format configuration property descriptions is not
supported.

See gh-18578

* pr/18580:
  Use LinkedHashSet for deterministic order in test assertions

Closes gh-18580

See gh-18580

* pr/18579:
  Rename tests to match Surefire expectations

Closes gh-18579

See gh-18579

* gh-18575:
  Make the logger static final

Closes gh-18575

See gh-18575

* pr/18546:
  Fix incorrect backslash escape in documentation sample

Closes gh-18546

See gh-18546

* gh-18539:
  Remove accidental usage of UnsupportedOptionException

Closes gh-18539

See gh-18539

Fixes gh-18410

Previously, Maven's default behaviour was relied up which resulted
in the artifact ID being appended to each URL as it was inherited.
This behaviour can only be disabled in Maven 3.6 and later, a version
that we cannot use due to an incompatibility with the Flatten Plugin.

This commit works around Maven's default behaviour by defining
properties for the SCM URL, connection, and developer connection and
then explicitly defining the settings in each pom using these
properties. The explicit definition of the properties in each pom
prevents them being inherited from the parent, thereby disabling the
unwanted appending of the artifact ID to the URL.

Fixes gh-18328

Update `JerseyManagementContextConfiguration` so that customizer beans
are not longer applied. The endpoint resource endpoints are now added
with a registrar bean `@PostConstruct` method.

Prior to this commit, when running the management server on a different
port a `Resource` added by a customizer could be added two different
`ResourceConfig` instance. This breaks the singleton contract expected
by Jersey.

Fixes gh-17801
Co-authored-by: Phillip Webb <pwebb@pivotal.io>

Along the way, this commit also fixes a typo.

Closes gh-18325

Closes gh-18466

Closes gh-18465

See gh-18315

Closes gh-18312

Closes gh-18312

Closes gh-18313

* pr/18445:
  Fix comment position in ZipHeaderPeekInputStreamTests

Closes gh-18445

See gh-18445

Closes gh-18414

Closes gh-18271

* pr/18378:
  Add Mustache to 'Customize ViewResolvers' docs section

Closes gh-18378

See gh-18378

See gh-18414

* pr/18339:
  Polish 'Apply TTL invocation caching on reactor types'
  Apply TTL invocation caching on reactor types

Closes gh-18339

Extract reactor specific code to an inner class to protect
against ClassNotFound exceptions if reactor is not in use.

Also add support for `Flux`.

See gh-18339