Closes gh-22895

Fixes gh-21542

Closes gh-22890

Closes gh-22685

Closes gh-21787

Closes gh-22887

Closes gh-22873

Closes gh-22872

Closes gh-22871

Closes gh-22870

Closes gh-22869

Closes gh-22868

Closes gh-22867

Closes gh-22866

Closes gh-22865

Closes gh-22864

Closes gh-22863

Closes gh-22862

Closes gh-22861

Closes gh-22860

Closes gh-22859

With the upgrade to the new Couchbase SDK and the related changes in
Spring Data Couchbase, CacheManagerCustomizer can no longer be used to
customize the Couchbase cache manager as it is an immutable class.

This commit introduces a dedicated callback for the
CouchbaseCacheManagerBuilder that is used by the auto-configuration and
update the documentation to refer to it with a sample usage.

Closes gh-22573

Closes gh-22615

Previously, UrlPathHelper's full path optimization was enabled when
there was a dispatcher servlet mapped to /. The UrlPathHelper is used
across Spring MVC and if there are multiple dispatcher servlets they
all share the sample UrlPathHelper. This meant that any additional
dispatcher servlets mapping to locations other than / would not be able
to map requests correctly as the UrlPathHelper would use the full path,
ignoring the url mapping of the dispatcher servlet.

This commit updates the MVC auto-configuration so that use of the full
path is only enabled if there's a single dispatcher servlet
registration.

Fixes gh-22682

Closes gh-22849

* pr/21615:
  Polish "Migrate legacy endpoint that have a dash in their id"
  Migrate legacy endpoint that have a dash in their id

Closes gh-21615

See gh-21615

See gh-21615

Closes gh-22847

* pr/22777:
  Polish "Propagate the cause that led Reactor"s debug agent to fail"
  Propagate the cause that led Reactor"s debug agent to fail

Closes gh-22777

See gh-22777

Prior to this commit, DebugAgentEnvironmentPostProcessor throws a
RuntimeException with a generic error message if its initialization
fails. The causing exception is discarded, which makes error analysis
unnecessarily difficult.

This commit attaches the cause to the newly thrown RuntimeException.

See gh-22777

Closes gh-22841

* pr/22760:
  Fix wrong reference in `ReadinessStateHealthIndicator` javadoc

Closes gh-22760

See gh-22760

See gh-22844