MT#63753 update db schema skip site_id check for non db nodes

* site_id is not checked for non db nodes, when revisions are applied,
  as site_id there is always null and on db nodes when something is
  applied, it becomes not null.

Change-Id: I2b9521db44bf8e3b519f3542046fd87027736c8c

ngcp-update-db-schema

@@ -1432,10 +1432,12 @@ def post_set_release_for_applied_revisions() -> None:
         return
 
     node_name = config.node_name
+    node_roles = config.node_roles
+    is_db_role = node_roles.get('ngcp_is_db') is True
     release = getattr(config, 'set_release', config.ngcp_version)
     cursor: pymysql.cursors.Cursor = config.db_conn.cursor()
 
-    if check_column_exists('site_id'):
+    if is_db_role and check_column_exists('site_id'):
         site_id = int(config.node_roles.get('ngcp_site_id') or 1)
         post_set_revisions = config._post_set_release_for_revisions
         cursor.execute(f"""