CDI missing tests for ELAwareBeanManager

[Azquelt]

We're missing tests for the ELAwareBeanManager bean specified in https://github.com/jakartaee/platform/blob/main/specification/src/main/asciidoc/platform/cdi-ee-spec/el.adoc

I think it's probably sufficient to check the bean exists and that BeanManager can be cast to ELAwareBeanManager. BeanManager still has all the methods that appear on ELAwareBeanManager, and they are tested in the core CDI TCK, though they are deprecated.