Remove unused struct fields (#12924)

app/notification_push.go

@@ -29,7 +29,6 @@ type PushNotificationsHub struct {
 }
 
 type PushNotification struct {
-	id                 string
 	notificationType   NotificationType
 	currentSessionId   string
 	userId             string

cmd/mattermost/commands/server_test.go

@@ -16,7 +16,6 @@ import (
 )
 
 type ServerTestHelper struct {
-	configStore        config.Store
 	disableConfigWatch bool
 	interruptChan      chan os.Signal
 	originalInterval   int