Previously, if a user's configuration class provided a custom
Validator bean, that configuration class would be initialized very
early so that the Validator could be used to create the
auto-configured MethodValidationPostProcessor. This early
initialization could problems as it may prevent any of the
configuration class's dependencies from being post-processed.

This commit updates the injection of the Validator bean to be lazy,
thereby preventing the creation of the auto-configured
MethodValidationPostProcessor from triggering early initialization.

Closes gh-9416

Closes gh-9812

Closes gh-9811

Closes gh-9810

Closes gh-9809

Closes gh-9808

Closes gh-9806

Closes gh-9802

Update HealthIndicatorAutoConfiguration to ensure that it is configured
after ActiveMQAutoConfiguration.

Fixes gh-9793

Closes gh-9740

* pr/9497:
  Fix metric check in case of duplicate metric

Closes gh-9497

Closes gh-4062

* pr/9672:
  Fix JOOQ sample's compiler configuration

Closes gh-9672

Closes gh-9726

Closes gh-9777

Fixes gh-9548

* pr/9772:
  Remove duplicate entry in .gitignore

Closes gh-9772

* pr/9740:
  Polish "Improve ExitCodeGenerator doc"
  Improve ExitCodeGenerator doc

Closes gh-9740

See gh-9740

Closes gh-9671

Closes gh-9705

Closes gh-9704

Closes gh-9703

Closes gh-9702

Closes gh-9701

Closes gh-9700

Closes gh-9699

Fixes gh-9693

Fixes gh-9351

Closes gh-9580

Closes gh-9270

Closes gh-9621