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

Update `CachingOperationInvoker` so that TTL caching is applied directly
to reactive types. Prior to this commit, a `Mono` would be cached, but
the values that it emitted would not.

See gh-18339

* pr/18333:
  Use ordered TaskExecutorCustomizers

Fixes gh-18333

Use an ordered stream in `TaskExecutionAutoConfiguration` when
obtaining the TaskExecutor customizers.

See gh-18333

Closes gh-18238

Closes gh-18407

Closes gh-18406

Closes gh-18405

Closes gh-18404

Closes gh-18403

Closes gh-18402

Closes gh-18401

Closes gh-18400

* pr/18347:
  Polish

Closes gh-18347

See gh-18347

* pr/18372:
  Fix typo in ApplicationContextAssert

Closes gh-18372

See gh-18372

Update `DataSourceInitializedPublisher` to fallback to the
`LocalContainerEntityManagerFactoryBean` if the
`javax.persistence.nonJtaDataSource` property is not defined.

As of Hibernate 4.3 the property is no longer set if the `EntityManager`
is created from a `PersistenceUnitInfo` instance rather than actual
properties.

Although this is being addressed in Hibernate issue HHH-13432, it's
not strictly a requirement of the JPA spec that the property is set.

Fixes gh-17061

See https://github.com/reactor/reactor-netty/issues/844

This also removes the need for the tomcat starter to be in provided
scope.

Closes gh-18346

Closes gh-18348