MM-4998 Adding LoginIdAttribute to allow LDAP users to change their login ID without losing their account (#8756)

* Adding LoginIdAttribute

* Modifying LDAP to use loginIDAttribute.

* Adding IDAttribute migration and AD objectGUID support.

* Removing unused idea.

* Fix typo.

store/store.go

@@ -228,7 +228,7 @@ type UserStore interface {
 	GetByAuth(authData *string, authService string) StoreChannel
 	GetAllUsingAuthService(authService string) StoreChannel
 	GetByUsername(username string) StoreChannel
-	GetForLogin(loginId string, allowSignInWithUsername, allowSignInWithEmail, ldapEnabled bool) StoreChannel
+	GetForLogin(loginId string, allowSignInWithUsername, allowSignInWithEmail bool) StoreChannel
 	VerifyEmail(userId string) StoreChannel
 	GetEtagForAllProfiles() StoreChannel
 	GetEtagForProfiles(teamId string) StoreChannel