Closes gh-15107

* pr/15103:
  Polish some Map operations

Closes gh-15103

* pr/15084:
  Remove unused static methods in tests

Closes gh-15084

`@EnableScheduling` detects primarily a suitable `TaskScheduler` in the
context and fallbacks to the presence of a `ScheduledExecutorService` if
that is not the case.

This commit improves the auto-configuration to back off when such
scheduled executor service is present, so that the framework
initialization code can pick it up as usual.

Closes gh-15032

* pr/15081:
  Polish contribution
  Update documentation to remind how JobParameters should be specified

Closes gh-15081

See gh-15081

* pr/15082:
  Add reference to Hiatus starter

Closes gh-15082

Prior to this commit, a change in `HttpStatus.toString` since SPR-16898
prevented the default WebFlux `ErrorWebExceptionHandler` to render
template views for exact HTTP status (e.g. "404.html").
This issue does not affect the resolution of series, like "4xx.html".

This commit fixes `DefaultErrorWebExceptionHandler` to use
`HttpStatus.value()` when attempting to resolve error views.

Closes gh-15083

Closes gh-15065

* pr/15060:
  Polish "Update docs to Spock 1.2"
  Update docs to Spock 1.2

Closes gh-15060

See gh-15060

See gh-15056

See gh-15058

Closes gh-15058

Closes gh-15056

Closes gh-15050

Closes gh-15026

* pr/15033:
  Simplify ArrayList calling addAll() immediately

Closes gh-15033

See gh-15031

See gh-15031

Closes gh-15031

* pr/15049:
  Polish EnableConfigurationPropertiesImportSelector javadoc

Closes gh-15049

Closes gh-15030