fix: @sharable is applied multiple times on PageInfo in multithreaded environments

Author: mak626

graphene_federation/schema.py

@@ -3,6 +3,7 @@
 
 from graphene import ObjectType, PageInfo
 from graphene_directives import (
+    DirectiveValidationError,
     SchemaDirective,
     build_schema as build_directive_schema,
     directive_decorator,
@@ -58,6 +59,9 @@ def _add_sharable_to_page_info_type(
         except ValueError:
             # Federation Version does not support @sharable
             pass
+        except DirectiveValidationError:
+            # In multithreaded environments, @sharable is applied multiple times on PageInfo
+            pass
 
 
 def build_schema(