chore: fix typo in INTERFACE_OBJECT_USAGE_ERROR message (#3431)

Author: dariuszkuc

composition-js/src/__tests__/compose.test.ts

@@ -3787,7 +3787,7 @@ describe('composition', () => {
       expect(result.errors).toBeDefined();
       expect(errors(result)).toStrictEqual([[
         'INTERFACE_OBJECT_USAGE_ERROR',
-        'Type "I" is declared with @interfaceObject in all the subgraphs in which is is defined (it is defined in subgraphs "subgraphA" and "subgraphB" but should be defined as an interface in at least one subgraph)'
+        'Type "I" is declared with @interfaceObject in all the subgraphs in which it is defined (it is defined in subgraphs "subgraphA" and "subgraphB" but should be defined as an interface in at least one subgraph)'
       ]]);
     });
 

composition-js/src/merging/merge.ts

@@ -878,7 +878,7 @@ class Merger {
         // leading to that type. But the error here is a bit more "direct"/user friendly than what post-merging
         // validation would return, so we make this a hard error, not just a warning.
         this.errors.push(ERRORS.INTERFACE_OBJECT_USAGE_ERROR.err(
-          `Type "${itfObjectType}" is declared with @interfaceObject in all the subgraphs in which is is defined (it is defined in ${printSubgraphNames(subgraphsWithType.map((s) => s.name))} but should be defined as an interface in at least one subgraph)`,
+          `Type "${itfObjectType}" is declared with @interfaceObject in all the subgraphs in which it is defined (it is defined in ${printSubgraphNames(subgraphsWithType.map((s) => s.name))} but should be defined as an interface in at least one subgraph)`,
           { nodes: sourceASTs(...subgraphsWithType.map((s) => s.schema.type(itfObjectType))) },
         ));
       }