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.

model/switch_request.go

@@ -15,7 +15,7 @@ type SwitchRequest struct {
 	Password       string `json:"password"`
 	NewPassword    string `json:"new_password"`
 	MfaCode        string `json:"mfa_code"`
-	LdapId         string `json:"ldap_id"`
+	LdapLoginId    string `json:"ldap_id"`
 }
 
 func (o *SwitchRequest) ToJson() string {