chore: remove unused ProjectFilesProvider implementation

The implementation had been used for old product that we do not support anymore.

Author: rosen-vladimirov

lib/common/appbuilder/appbuilder-bootstrap.ts

@@ -1,5 +1,4 @@
 require("../bootstrap");
-$injector.require("projectFilesProvider", "./appbuilder/providers/project-files-provider");
 $injector.require("pathFilteringService", "./appbuilder/services/path-filtering");
 $injector.require("liveSyncServiceBase", "./services/livesync-service-base");
 $injector.require("androidLiveSyncServiceLocator", "./appbuilder/services/livesync/android-livesync-service");