Configure provider server.

Configuring provider server with a nil configuration request lets
server retrieve already-configured provider's configuration.

Signed-off-by: Cem Mergenci <cmergenci@gmail.com>

pkg/controller/external_terraform_plugin_framework.go

@@ -223,14 +223,20 @@ func (c *TerraformPluginFrameworkConnector) Connect(ctx context.Context, mg xpre
 		opTracker.SetTfState(s)
 	}
 
+	server := providerserver.NewProtocol5(*c.terraformPluginFrameworkProvider)()
+	_, err = server.ConfigureProvider(ctx, nil)
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot configure provider server")
+	}
+
 	return &terraformPluginFrameworkExternalClient{
 		ts:             ts,
 		config:         c.config,
 		logger:         logger,
 		metricRecorder: c.metricRecorder,
 		opTracker:      opTracker,
 		resource:       c.config.TerraformPluginFrameworkResource,
-		server:         providerserver.NewProtocol5(*c.terraformPluginFrameworkProvider)(),
+		server:         server,
 		params:         params,
 		// rawConfig:      rawConfig,
 	}, nil