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

* MM-41211: Accepts a decimal for the SSO session length.

* MM-41211: Fixes test and logic error.

* MM-41211: Validates session length is minimum 1 hour.

* MM-41211: Tricking the CI to allow an empty string.

* Fixes a test error and some lint changes.

* Fix error.

* Reverting IDE change.

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

services/upgrader/upgrader.go

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