Removed filesAPI GA labs flag

refs https://github.com/TryGhost/Team/issues/1258

- files API is GA so labs flag and conditional access to files API routes is no longer necessary

core/frontend/web/site.js

@@ -120,7 +120,7 @@ module.exports = function setupSiteApp(options = {}) {
     // Serve blog media using the storage adapter
     siteApp.use(STATIC_MEDIA_URL_PREFIX, storage.getStorage('media').serve());
     // Serve blog files using the storage adapter
-    siteApp.use(STATIC_FILES_URL_PREFIX, labs.enabledMiddleware('filesAPI'), storage.getStorage('files').serve());
+    siteApp.use(STATIC_FILES_URL_PREFIX, storage.getStorage('files').serve());
 
     // Global handling for member session, ensures a member is logged in to the frontend
     siteApp.use(membersService.middleware.loadMemberSession);

core/server/web/api/canary/admin/routes.js

@@ -252,7 +252,6 @@ module.exports = function apiRoutes() {
 
     // ## files
     router.post('/files/upload',
-        labs.enabledMiddleware('filesAPI'),
         mw.authAdminApi,
         apiMw.upload.single('file'),
         http(api.files.upload)

core/shared/labs.js

@@ -15,7 +15,6 @@ const messages = {
 
 // flags in this list always return `true`, allows quick global enable prior to full flag removal
 const GA_FEATURES = [
-    'filesAPI',
     'fileCard',
     'headerCard'
 ];