Exception for multiple HTTP authentication mechanisms is never thrown.

[KeesKoffeman]

Describe the bug
When multiple HTTP authentication mechanisms are present (not implemented yet) a IllegalStateException should be thrown but is not.

Expected behavior
The IllegalStateException to be thrown.

Actual behavior
(Describe the actual behavior clearly and concisely.)

To Reproduce
Steps to reproduce the behavior:

1. Create new project and add 'io.quarkus:quarkus-smallrye-jwt' and 'io.quarkus:quarkus-oidc'.
2. Set quarkus.oidc.tenant-enabled=false to avoid startup error.
3. Quarkus starts up without IllegalStateException

Configuration

# Add your application.properties here, if applicable.
quarkus.oidc.tenant-enabled=false

Additional context
In HttpAuthenticator.java lift if (instance.isAmbiguous()) out of if (instance.isResolvable()).

@Inject
    public HttpAuthenticator(Instance<HttpAuthenticationMechanism> instance,
            Instance<IdentityProvider<UsernamePasswordAuthenticationRequest>> usernamePassword) {
        if (instance.isResolvable()) { 
            **if (instance.isAmbiguous()) {** // Not reachable due because isResolvable checks !isAmbiguous
                throw new IllegalStateException("Multiple HTTP authentication mechanisms are not implemented yet, discovered "
                        + instance.stream().collect(Collectors.toList()));
            }
            mechanism = instance.get();
        } else {
            if (!usernamePassword.isUnsatisfied()) {
                //TODO: config
                mechanism = new BasicAuthenticationMechanism("Quarkus");
            } else {
                mechanism = new NoAuthenticationMechanism();
            }
        }
    }