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

Closes gh-16576

* pr/16688:
  Polish

Closes gh-16688

See gh-16688

* pr/15988:
  Polish "Allow configuration of auto-timed metrics"
  Allow configuration of auto-timed metrics

Closes gh-15988

When `management.metrics.web.server.auto-time-requests` is enabled
(default=true), Spring Boot collects metrics on controller methods even
when they are not annotated with `@Timed`.

When this happens, created metrics are based on the default
`@Timed` configuration and there is no way to customize the
configuration of those auto-timed controller metrics.

This commit adds default configurations to auto-timed requests on both
client and server sides.

See gh-15988

This should fix the NoClassDefFound errors after moving to Framework
snapshots

This commit also documents `ContextRefreshedEvent` and
`WebServerInitializedEvent`.

Closes gh-7382

Closes gh-16661

* pr/16622:
  Polish "Document use of @Profile with @ConfigurationProperties scanning"
  Document use of @Profile with @ConfigurationProperties scanning

Closes gh-16622

See gh-16612

* appendix-properties-styling:
  Polish "Separate compound properties in appendices"
  Separate compound properties in appendices

Closes gh-16480

* pr/16604:
  Polish "Auto-configure ReactiveStringRedisTemplate if necessary"
  Auto-configure ReactiveStringRedisTemplate if necessary

Closes gh-16604

See gh-16604

* pr/16628:
  Exclude HikariCP specific dependency from Quartz

Closes gh-16628