It is by design not possible to generate code that handles
bean definitions with user-provided instance suppliers because
the JVM does not allow to get a stable reference reusable at
runtime on the lambda or method reference in the code generated
AOT.
Before this commit, such instance supplier was ignored.
After this commit, an IllegalArgumentException is thrown,
allowing projects to be aware this is not supported and enforce
related refactorings.
The related issue gh-29555 describes how this limitation could
be relaxed in the future.
Closes gh-29556
ab0d1c395d