Quarkus REST - Be more forgiving when adding headers #47546
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The JAX-RS API is very loose and allows adding Object and in some cases we actually add a List to the headers and we need to take this into account.
While I'm usually not for handling things this way, the API is not enforcing things properly so I think we really need to handle this ourself and be more forgiving if a list is added.
Fixes #47507