Closes gh-11207

* pr/11206:
  Polish

Closes gh-11206

Restore `spring-boot-maven-plugin` dependency in `maven-shade-plugin`
starter configuration. Required so that the shade plugin can use
`PropertiesMergingResourceTransformer` if wanted.

Fixes gh-11200

Closes gh-11204

* pr/11190:
  Update Apache Maven Central repository url

Closes gh-11190

Closes gh-11148

Rather than using two properties to enable or disable reactive and
imperative repositories for a particular store, this commit introduces
a new repository type condition that's backed by a single
spring.data.<store>.repositories.type property. The type can be
auto (automatically enables whatever's available), imperative (enables
imperative repositories), none (enables nothing), or reactive (enables
reactive repositories). The default is auto.

Repositories do not have a reactive option (such as JPA) continue to
have a spring.data.<store>.repositories.enabled property that takes a
boolean value.

Closes gh-11134

Closes gh-11090

If the WebFlux handler commits the response but still sends an error
signal in the reactive pipeline, Spring Boot error handling should not
try to handle that error: once committed, it is impossible to change the
response status or the response headers. Writing to the body might also
lead to invalid responses.

This commit skips error handling if the response is committed and
delegates to Spring Framework's `HttpWebHandlerAdapter` which will log
the error.

Fixes gh-11168

See gh-11071

* pr/11189:
  Fix typo in StringUtils import

Closes gh-11189

Closes #11090

Closes gh-11155

* pr/11193:
  Polish

Closes gh-11193

See gh-11193

This commit adds support for basic auto-configuration for the Freemarker
template engine in WebFlux.

A few configuration properties in the `spring.freemarker.*` namespace
aren't supported yet, since they mostly apply to MVC (Servlet request
and session attributes).

Closes gh-10094

Align reactive and non-reactive web extensions and update `showDetails`
so that it only applies to web exposure.

See gh-11113
See gh-11192

Fixes gh-11192

* pr/11071:
  Polish micrometer rc.5 upgrade
  Upgrade to micrometer 1.0.0-rc.5

Closes gh-11071

See gh-11071

Fixes gh-10832

Closes gh-11085

Closes gh-11186

Closes gh-11184

* gh-11117:
  Complete the removal of Spring Social starters and auto-configuration
  Remove Spring Social starters and auto-configuration

Closes gh-11117