Implement LDAP Certificate (#15361)

* Implement LDAP Certificate

* add diagnostics and translations

* update from code review

* pass pointer to update pict function

* pass object to first function

* remove debug log messages

* update test to add localmode test

* update lint errors

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/ldap.go

@@ -4,5 +4,7 @@
 package model
 
 const (
-	USER_AUTH_SERVICE_LDAP = "ldap"
+	USER_AUTH_SERVICE_LDAP      = "ldap"
+	LDAP_PUBIC_CERTIFICATE_NAME = "ldap-public.crt"
+	LDAP_PRIVATE_KEY_NAME       = "ldap-private.key"
 )