See gh-14736

Closes gh-15456

Closes gh-14737
Co-authored-by: Stephane Nicoll <snicoll@pivotal.io>

Closes gh-14736
Co-authored-by: Stephane Nicoll <snicoll@pivotal.io>

Closes gh-14738

Closes gh-16746

* gh-16728:
  Add dependency management for remaining non-example Kafka modules
  Add dependency management for kafka-streams-test-utils

Closes gh-16728

See gh-16728

See gh-16728

The `spring-boot-test` module has a dependency to TestNG to validate
some part of the test infrastructure but no tests are actually written
using TestNG. The presence of TestNG is a trigger for the maven surefire
plugin and it attempts to run tests using it.

This commit defines the explicit provider to use (JUnit 4)

Closes gh-16735

* pr/16731:
  Polish indentation

Closes gh-16731

Closes gh-16726

Closes gh-16725

See gh-16723

* pr/16719:
  Polish "Add link to Heroku article"
  Add link to Heroku article

Closes gh-16719

See gh-16719

See gh-16714

Prior to this commit, the audit auto-configuration provided
an `InMemoryAuditEventRepository` bean. This commit changes the auto-config
so that an `AuditEventRepository` is not provided and instead the auto-config
is conditional on the presence of a `AuditEventRepository` bean. This is done
to encourage the use of a custom implementation of `AuditEventRepository`
since the in-memory one is quite limited and not suitable for production.
A flag is available if the auto-configuration needs to be turned off even
in the presence of a bean.

Closes gh-16110

See gh-15039

Prior to this commit, the http trace auto-configuration provided
an `InMemoryHttpTraceRepository` bean. This commit changes the auto-config
so that an `HttpTraceRepository` is not provided and instead the auto-config
is conditional on the presence of a `HttpTraceRepository` bean. This is done
to encourage the use of a custom implementation of `HttpTraceRepository`
since the in-memory one is quite limited and not suitable for production.
A flag is available if the auto-configuration needs to be turned off even
in the presence of a bean.

Closes gh-15039

* pr/16707:
  Polish "Document that JUnit 4 is the default"
  Document that JUnit 4 is the default

Closes gh-16707

See gh-16707

Closes gh-16681

* pr/16700:
  Polish RSocketServerBootstrap bean name

Closes gh-16700

* pr/16699:
  Polish CompressionConnectorCustomizerTests

Closes gh-16699

Closes gh-16693