Revert "MM-41211: Adds ability to set SessionLengthSSOInDays to a decimal. (#19396)" (#19563)

This reverts commit 7398451030.

services/upgrader/upgrader.go

@@ -1,6 +1,5 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
-//go:build !linux
 // +build !linux
 
 package upgrader