Closes gh-25823

Closes gh-25822

Closes gh-25821

See gh-25820

See gh-25819

Closes gh-25820

Closes gh-25819

Closes gh-24741

See gh-24741

See gh-24741

Closes gh-25788

Closes gh-25813

Closes gh-25812

* pr/25810:
  Fix flaky QuartzAutoConfigurationTests

Closes gh-25810

See gh-25810

Closes gh-25811

Closes gh-25789

* gh-25809:
  Increase test coverage on Java 16

Closes gh-25809

See gh-25809

Fixes gh-25736

Closes gh-25799

Previously, the configuration metadata annotation processor only
declared support for `@Endpoint` and none of the other more
specialized `@…Endpoint` annotations that are meta-annotated with
`@Endpoint` such as `@WebEndpoint` and `@JmxEndpoint. This would
result in missing metadata if a full or incremental build only
compiled classes annotated with one of the more specialized
`@…Endpoint` annotations as the annotation processor would not be
called.

This commit updates the processor's supported annotation types to
include every known `@…Endpoint` annotation. The test processor has
also been similarly updated to align its behaviour with that of the
main processor.

Fixes gh-25388

Closes gh-25790

Deprecate the `Bootstrapper` interface entirely and provide a
`BootstrapRegistryInitializer` alternative so that people can migrate.

Unfortunately our previous attempt to fix the typo in the `Bootstrapper`
interface didn't provide us a way to remove the deprecated method
without impacting users. It was also problematic for people who were
implementing `Bootstrapper` rather than using a lambda since they needed
to introduce the deprecated method.

We unfortunately can't see a way to fix the original typo without
introducing a new interface.

Fixes gh-25735

Closes gh-25787

Closes gh-25786

* pr/25778:
  Polish 'Ignore quality value when removing MediaType.ALL'
  Ignore quality value when removing MediaType.ALL

Closes gh-25778

See gh-25778

Update the default reactive exception handler so that `MediaType.ALL`
is removed regardless of any quality setting. Prior to this commit,
the "match-all" media type was not properly ignored if it has a quality
value and would show HTML content if the accept header was
`application/json, */*;q=0.9`.

See gh-25778

Closes gh-25785

Closes gh-25784

Update `AbstractWebMvcEndpointHandlerMapping` to chain any caught
InvalidEndpointRequestExceptions so that a more complete stacktrace
is available. The exception has also been updated to a
`ResponseStatusException` so that the reason can be propagated.

Fixes gh-25642

Closes gh-25783

Closes gh-25782

Previously, the auto-configuration for DataSource initialization and
the properties used to configure it were part of the general
DataSource auto-configuration and properties.

This commit moves the auto-configuration of DataSource initialization
out into a separate top-level auto-configuration class. Similarly,
the properties for configuring DataSource initialization have been
moved from `spring.datasource.*` into `spring.sql.init.*`.

The old initialization-related `spring.datasource.*` properties have
been deprecated but can still be used. When they are used, they new,
separate initialization auto-configuration will back off. In other
words, the initialization related `spring.datasource.*` properties
and the `spring.sql.init.*` properties cannot be used in combination.

Closes gh-25323

See gh-25487