The upgrade to 4.x was breaking some behavior in our tests.
We need to reconsider this upgrade and check our mockrestserver usage in
our tests.

Closes gh-23459

MergedAnnotations provides 'from' variants with RepeatableContainers but without AnnotationFilter argument now, avoiding the need to refer to AnnotationFilter.PLAIN as a default at call sites.

The org.reactivestreams has 13 instead of 4 classes in 1.0.3 with the
addition of Java 9 Flow adapters. This commit switches to using a
different package reactor.util.annotation, also with a small number of
classes, for this test.

Closes: gh-23579

Closes gh-23374

Closes gh-23360

This commit adds Coroutines extensions for
TransactionalOperator.transactional that accept suspending lambda or
Kotlin Flow parameters.

@Transactional on suspending functions is not supported yet, gh-23575
has been created for that purpose.

Closes gh-22915

See gh-23572

Prior to this commit, tests in spring-web and spring-webflux were no
longer executed due to the removal of the Hamcrest dependency in
commit bb03cdf5.

See gh-23572

This commit enables the publishing of Gradle metadata with Spring
Framework artifacts. This feature will be enabled by default with Gradle
6.0, so Spring Framework will consistently push this information in the
5.2.x generation.

Fixes gh-23503

See gh-21778

This commit revised the paragraph regarding the need to consume or
release the ClientResponse body when using WebClient::exchange.

Closes gh-23498

See gh-23498

See gh-23498

... but continue to execute `Abstract*Tests` classes.

Prior to this commit, ClassUtils.isPrimitiveOrWrapper() and
ClassUtils.isPrimitiveWrapper() did not return true for Void.class.
However, ClassUtils.isPrimitiveOrWrapper() did return true for
void.class. This lacking symmetry is inconsistent and can lead to bugs
in reflective code.

See: https://github.com/spring-projects/spring-data-r2dbc/issues/159

This commit addresses this by adding an entry for Void.class -> void.class
in the internal primitiveWrapperTypeMap in ClassUtils.

Closes gh-23572

Also minor refactoring in decoding in order to tolerate the absence of
a charset and treat as US_ASCII.

See gh-23485

Closes gh-23485

As an added bonus, AbstractViewTests is now executed in the build.

Hamcrest is now only used within spring-test for MockMvc support.