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When running on Java 11 (where `@PostConstruct` is no longer part of the JRE) and without a dependency on jakarta-annotation-api, `@PostContruct` annotions are silently dropped. This leads to obscure and hard-to-track down changes in the behaviour of our auto-configuration as the `@PostConstruct`-annotated methods are not invoked. To allow users to run on Java 11 without having jakarta-annotation-api on the classpath, this commit removes use of `@PostConstruct` from main code. A Checkstyle rule has also been added to prevent its usage in main code from being reintroduced. Closes gh-23723