When ReactiveJwtAuthenticationConverter bean defined, use it in OAuth2 Resource Server config automatically

[ThomasVitale]

Expected Behavior

When I define a bean of type ReactiveJwtAuthenticationConverter, I would expect it to be considered in the OAuth2 Resource Server configuration automatically like it happens with its imperative counterpart (JwtAuthenticationConverter).

Current Behavior

When I define a bean of type ReactiveJwtAuthenticationConverter, it's not considered in the OAuth2 Resource Server configuration. Instead, it requires explicit definition through the DSL as follows.

.oauth2ResourceServer(oauth2 -> oauth2.jwt(jwt ->
						jwt.jwtAuthenticationConverter(jwtAuthenticationConverter())))

Context

It would be nice to align the behaviour between reactive and non-reactive applications since it could generate some confusion.

Proposed solution: #9699