Revert "[MM-41576] Revamp database schema version (#19586)" (#19746)

* Revert "[MM-41576] Revamp database schema version (#19586)"

This reverts commit 645fee3fe3.

* Revert "MM-42049 - license endpoint not working (#19686)"

This reverts commit 4fe89e5847.

store/timerlayer/timerlayer.go

@@ -10616,6 +10616,10 @@ func (s *TimerLayer) DropAllTables() {
 	s.Store.DropAllTables()
 }
 
+func (s *TimerLayer) GetCurrentSchemaVersion() string {
+	return s.Store.GetCurrentSchemaVersion()
+}
+
 func (s *TimerLayer) LockToMaster() {
 	s.Store.LockToMaster()
 }