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

* revamp db version and add applied migrations endpoint

* replace old schema version with new

* add db version subcommand

* add to local api

* reflect review comments

* log errors

* remove setting the version from model.CurrentVersion

* fix a test

testlib/store.go

@@ -110,5 +110,7 @@ func GetMockStoreForSetupFunctions() *mocks.Store {
 	mockStore.On("Session").Return(&sessionStore)
 	mockStore.On("OAuth").Return(&oAuthStore)
 	mockStore.On("Group").Return(&groupStore)
+	mockStore.On("GetDBSchemaVersion").Return(1, nil)
+
 	return &mockStore
 }