Moving filesstore services into shared folder (#16940)

* Moving filesstore services into shared folder

* Fixing app-layers generation

* Renaming from filesstore to filestore

app/server.go

@@ -44,7 +44,6 @@ import (
 	"github.com/mattermost/mattermost-server/v5/plugin"
 	"github.com/mattermost/mattermost-server/v5/services/awsmeter"
 	"github.com/mattermost/mattermost-server/v5/services/cache"
-	"github.com/mattermost/mattermost-server/v5/services/filesstore"
 	"github.com/mattermost/mattermost-server/v5/services/httpservice"
 	"github.com/mattermost/mattermost-server/v5/services/imageproxy"
 	"github.com/mattermost/mattermost-server/v5/services/mailservice"
@@ -54,6 +53,7 @@ import (
 	"github.com/mattermost/mattermost-server/v5/services/timezones"
 	"github.com/mattermost/mattermost-server/v5/services/tracing"
 	"github.com/mattermost/mattermost-server/v5/services/upgrader"
+	"github.com/mattermost/mattermost-server/v5/shared/filestore"
 	"github.com/mattermost/mattermost-server/v5/shared/i18n"
 	"github.com/mattermost/mattermost-server/v5/store"
 	"github.com/mattermost/mattermost-server/v5/store/localcachelayer"
@@ -1573,9 +1573,9 @@ func (s *Server) stopSearchEngine() {
 	}
 }
 
-func (s *Server) FileBackend() (filesstore.FileBackend, *model.AppError) {
+func (s *Server) FileBackend() (filestore.FileBackend, *model.AppError) {
 	license := s.License()
-	backend, err := filesstore.NewFileBackend(s.Config().FileSettings.ToFileBackendSettings(license != nil && *license.Features.Compliance))
+	backend, err := filestore.NewFileBackend(s.Config().FileSettings.ToFileBackendSettings(license != nil && *license.Features.Compliance))
 	if err != nil {
 		return nil, model.NewAppError("FileBackend", "api.file.no_driver.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}