PLT-2687 sending email on upgrade and moving profile pic to new location (#2808)

* Fixing CLI and adding unit tests

* Adding the upgrade_db_30 to the help text

* Adding the upgrade_db_30 to the help text

* Adding the upgrade_db_30 to the help text

* Fixing CLI tests

* PLT-2687 sending email on upgrade and moving profile pic to new location

* Fixing img move

* Fixing moving of profile image

* making upgrade email localizable

* Fixing email template

api/post.go

@@ -1211,7 +1211,7 @@ func DeletePostFilesAndForget(teamId string, post *model.Post) {
 			splitUrl := strings.Split(filename, "/")
 			oldPath := prefix + splitUrl[len(splitUrl)-2] + "/" + splitUrl[len(splitUrl)-1]
 			newPath := prefix + splitUrl[len(splitUrl)-2] + "/deleted_" + splitUrl[len(splitUrl)-1]
-			moveFile(oldPath, newPath)
+			MoveFile(oldPath, newPath)
 		}
 
 	}()