Closes gh-10910

Closes gh-10909

Closes gh-10908

Closes gh-10905

On WebSphere Liberty, the javax.validation package may be visible but
other javax.validation packages upon which it depends may not be
visible. This can lead to an incorrect assumption that the Bean
Validation API is available when, in fact, it is only partially
available.

Add an additional check for the availability of a class in the
javax.validation.bootstrap package to ensure that it's not just the
javax.validation package that's available.

Closes gh-10877

* pr/10811:
  Fix typos in ApplicationArguments and Library

Closes gh-10811

Closes gh-10826

* pr/10805:
  Remove unnecessary assignments

Closes gh-10805

* pr/10806:
  Handle null early in Sanitizer.sanitize()

Closes gh-10806

* pr/10810:
  Fix typos in AutoConfigureRestDocs

Closes gh-10810

* pr/10612:
  Polish JobLauncherCommandLineRunner

The JobLauncherCommandLineRunner reassigned method arguments inside the
merge method. Instead of reassigning the method argument just return
the new instance directly.

Also some minor cleanup (unnesseccary null check and continue keyword).

Closes gh-10612

* pr/10774:
  Remove static Boot version from documentation

Closes gh-10774

Closes gh-10626

Closes gh-10727

Closes gh-10730

Closes gh-10729

Closes gh-10728

Closes gh-8899

Closes gh-7999

Closes gh-10709

Closes gh-10687

Closes gh-10651

* gh-10635:
  Fix typo in documentation

- As error handling sample is using `CustomErrorType`, fix
  description which mentions `CustomerErrorType`.

Closes gh-10632

Closes gh-10631

Closes gh-10630

Closes gh-10629

* gh-10588:
  Polish "Provide informative reason when rejecting request with invalid level"
  Provide informative reason when rejecting request with invalid level

See gh-10588

Previously, bad request with no reason was included in the response.
This commit introduces the reason when invalid log level is sent in the
request.

Fixes gh-10588