Fix hibernate-reactive-rest-data-panache when adding smallrye openapi

[Sgitario]

As generating a parameterized type is too complex to do with gizmo (it will be addressed in quarkusio/gizmo#70), these changes implement a workaround so the extension hibernate-reactive-rest-data-panache does not fail when adding the smallrye openapi extension.

The ultimate solution should be:

• to generate parameterized types (Uni<Entity> instead of only Uni).
• to make smallrye openapi more robust (see related comment here and here).

Fix #25990

[geoand]

to generate parameterized types (Uni instead of only Uni)

Why can't we do this now? It should not be too hard to add a method signature manually (we already do this in some places)

[Sgitario]

to generate parameterized types (Uni instead of only Uni)

Why can't we do this now? It should not be too hard to add a method signature manually (we already do this in some places)

This was my first approach and could not make it work with a simple get method (I always got exceptions when generating the method) - and the signature seems to be right.
For sure, it's technically possible, but honestly, I think it does not worth it as it could be easily done after quarkusio/gizmo#70.

[geoand]

This was my first approach and could not make it work with a simple get method (I always got exceptions when generating the method) - and the signature seems to be right.

When I had to do this in other cases, I would see what javac generated (using javap -v ... ) for a comparable Java method.

[Sgitario]

This was my first approach and could not make it work with a simple get method (I always got exceptions when generating the method) - and the signature seems to be right.

When I had to do this in other cases, I would see what javac generated (using javap -v ... ) for a comparable Java method.

Thanks to this tool, I could see what I was doing wrong with the signature.
Closing and the final fix will be done in #26074.