Closes gh-13016

Closes gh-13015

Closes gh-13103

Previously, when the Jersey-based Actuator was configure with a
separate management port, the resulting child context would fail to
start due to their being no ResourceConfigCustomizer beans available.

This commit updates the configuration so that the customizer's are
injected using an ObjectProvider and an empty list is used in the
event of their being no customizer beans. This aligns the child
context configuration class with JerseyAutoConfiguration which
already used this approach.

Closes gh-12975

Closes gh-13018

* gh-13090:
  Polish "Clarify deployment of Spring Boot apps to App Engine Standard"
  Clarify deployment of Spring Boot apps to App Engine Standard

See gh-13090

Closes gh-13090

Closes gh-13098

Closes gh-13028

Closes gh-13029

Closes gh-13100

Closes gh-13099

Closes gh-13017

Closes gh-13014

Closes gh-13097

Closes gh-13021

Closes gh-13013

Closes gh-13097

See gh-13078

* pr/13084:
  Remove MockServletWebServer.emptyEnumeration()

Closes gh-13084

* pr/13085:
  Fix deprecation warning in OriginTrackedYamlLoader

Closes gh-13085

Closes gh-12848

This commit removes Hibernate imports from JpaProperties so that it can
be used with another JPA provider.

This commit is a breaking change for an internal, yet public class used
to transmit customizations provided by the user. It does not change the
external functionality though: naming strategies defined as bean are
still taken into account and a customizer has a chance to override it
regardless.

Closes gh-13043

See gh-12934

Fixes gh-12807

Fixes gh-12934