* gh-18349:
  Fix deprecation warnings caused by BodyInserters.fromObject

Closes gh-18349

See gh-18349

* gh-18351:
  Fix checkstyle errors in SampleReactiveOAuth2ClientApplicationTests

Closes gh-18351

See gh-18351

Closes gh-18276

Closes gh-18348

Allow legacy actuator endpoint IDs that contain dots to be transparently
migrated to the new format. This update will allow Spring Cloud users
to proactively migrate from endpoints such as `hystrix.stream` to
`hystrixstream`.

Closes gh-18148

Closes gh-18345

This will ensure that ReactiveManagementWebSecurityAutoConfiguration backs
off and that the actuator endpoints are also secured via OAuth2.

Fixes gh-17949

Closes gh-18343

Fixes gh-18136

Fixes gh-18332

This reverts commit 90defac7.

Closes gh-18335

Previously, a number of usages of @ConditionalOnMissingBean prevented
a bean that implements an auto-configured bean's "main" interface from
causing the auto-configuration of the bean to back off. This would
happen when @ConditionalOnMissingBean did not specify a type, the
@Bean method returned the bean's concrete type, and that concreate
type implements a "main" interface.

This commit updates such usages of @ConditionalOnMissingBean to
specify the "main" interface as the type of the bean that must be
missing. This will allow, for example, the auto-configured
MongoTemplate bean to back off when a MongoOperations bean is defined.

Fixes gh-18101

This commit also fixes a link in the reference documentation.

See gh-18293

Closes gh-18338

* gh-18337:
  Test compression with invalid content type for all webservers

Closes gh-18337

See gh-18337

* gh-18330:
  Add dependency management for io.rest-assured:spring-web-test-client

Closes gh-18330

See gh-18330

See gh-18194

Closes gh-18336

* pr/18331:
  Fix property name in "Task Execution and Scheduling" example

Closes gh-18331

See gh-18331

Restore `HealthIndicatorRegistry` and `ReactiveHealthIndicatorRegistry`
auto-configured beans with a version that adapts to the new contributor
interfaces.

Closes gh-16903

Update `ArtemisConnectionFactoryFactory` to reference the new
embedded Artemis classes.

See gh-16646

Temporarily update `spring-boot-starter-data-rest` to declare
the correct spring-plugin version.

Closes gh-16646

* gh-18321:
  Polish "Reference Spring Framework RSocket section + polish"
  Reference Spring Framework RSocket section + polish

Closes gh-18321

See gh-18321

Closes gh-18323

Closes gh-18319

See gh-18316