[MM-40735] Add MattermostAppID to OAuth app (#19214)

model/session.go

@@ -24,6 +24,8 @@ const (
 	SessionPropUserAccessTokenId  = "user_access_token_id"
 	SessionPropIsBot              = "is_bot"
 	SessionPropIsBotValue         = "true"
+	SessionPropOAuthAppID         = "oauth_app_id"
+	SessionPropMattermostAppID    = "mattermost_app_id"
 	SessionTypeUserAccessToken    = "UserAccessToken"
 	SessionTypeCloudKey           = "CloudKey"
 	SessionTypeRemoteclusterToken = "RemoteClusterToken"