MM-25394 session expired push notifications (#14732)

* new job type created that checks for expired mobile sessions and pushes notifications.

* only send session expired notifications if ExtendSessionLengthWithActivity is enabled.

* includes schema change:  field added to Sessions table

store/sqlstore/upgrade.go

@@ -19,6 +19,8 @@ import (
 
 const (
 	CURRENT_SCHEMA_VERSION   = VERSION_5_24_0
+	VERSION_5_26_0           = "5.26.0"
+	VERSION_5_25_0           = "5.25.0"
 	VERSION_5_24_0           = "5.24.0"
 	VERSION_5_23_0           = "5.23.0"
 	VERSION_5_22_0           = "5.22.0"
@@ -179,6 +181,8 @@ func upgradeDatabase(sqlStore SqlStore, currentModelVersionString string) error
 	upgradeDatabaseToVersion522(sqlStore)
 	upgradeDatabaseToVersion523(sqlStore)
 	upgradeDatabaseToVersion524(sqlStore)
+	upgradeDatabaseToVersion525(sqlStore)
+	upgradeDatabaseToVersion526(sqlStore)
 	return nil
 }
 
@@ -803,3 +807,19 @@ func upgradeDatabaseToVersion524(sqlStore SqlStore) {
 		saveSchemaVersion(sqlStore, VERSION_5_24_0)
 	}
 }
+
+func upgradeDatabaseToVersion525(sqlStore SqlStore) {
+	// TODO: uncomment when the time arrive to upgrade the DB for 5.25
+	//if shouldPerformUpgrade(sqlStore, VERSION_5_24_0, VERSION_5_25_0) {
+	//saveSchemaVersion(sqlStore, VERSION_5_25_0)
+	//}
+}
+
+func upgradeDatabaseToVersion526(sqlStore SqlStore) {
+	// TODO: uncomment when the time arrive to upgrade the DB for 5.26
+	//if shouldPerformUpgrade(sqlStore, VERSION_5_25_0, VERSION_5_26_0) {
+	sqlStore.CreateColumnIfNotExists("Sessions", "ExpiredNotify", "boolean", "boolean", "0")
+
+	//saveSchemaVersion(sqlStore, VERSION_5_26_0)
+	//}
+}