Add back consumeAndClose functionality. (#7608)

* consume bodies for action button integrations, webrtc gateway, oauth
endpoint

* Fixing a couple more places, switching to io.Copy to ioutil.Discard, adding a comment to help prevent future performance regressions

app/security_update_check.go

@@ -80,8 +80,7 @@ func (a *App) DoSecurityUpdateCheck() {
 				}
 
 				bulletins := model.SecurityBulletinsFromJson(res.Body)
-				ioutil.ReadAll(res.Body)
-				res.Body.Close()
+				consumeAndClose(res)
 
 				for _, bulletin := range bulletins {
 					if bulletin.AppliesToVersion == model.CurrentVersion {