[fix][broker] Call originalAuthState.authenticate in ServerCnx

This change was introduced by #19295.

That PR had more changes than are worth cherry-picking, though, so this
commit only has the additional call to authenticate the original auth data.
As a result, this commit is slightly less efficient because in some
implementations, the authdata will be validated twice.

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

@@ -917,10 +917,12 @@ protected void handleConnect(CommandConnect connect) {
                                     + " using auth method [%s] is not available", originalAuthMethod));
                 }
 
+                AuthData originalAuthDataCopy =  AuthData.of(connect.getOriginalAuthData().getBytes());
                 originalAuthState = originalAuthenticationProvider.newAuthState(
-                        AuthData.of(connect.getOriginalAuthData().getBytes()),
+                        originalAuthDataCopy,
                         remoteAddress,
                         sslSession);
+                originalAuthState.authenticate(originalAuthDataCopy);
                 originalAuthData = originalAuthState.getAuthDataSource();
                 originalPrincipal = originalAuthState.getAuthRole();