Fix Countries GQL resolver

ee/app/assets/javascripts/subscriptions/buy_minutes/graphql/resolvers.js

@@ -15,7 +15,7 @@ export const resolvers = {
         .then(({ data }) =>
           data.map(([name, alpha2]) =>
             // eslint-disable-next-line @gitlab/require-i18n-strings
-            ({ name, alpha2, __typename: 'Country' }),
+            ({ name, id: alpha2, __typename: 'Country' }),
           ),
         )
         .catch(() => createFlash({ message: ERROR_FETCHING_COUNTRIES }));

ee/app/assets/javascripts/subscriptions/graphql/queries/countries.query.graphql

+query Countries {
+  countries @client {
+    id
+    name
+  }
+}

ee/spec/frontend/subscriptions/buy_minutes/graphql/resolvers_spec.js

@@ -62,8 +62,8 @@ describe('~/subscriptions/buy_minutes/graphql/resolvers', () => {
 
           expect(createFlash).not.toHaveBeenCalled();
           expect(result).toStrictEqual([
-            { name: 'United States of America', alpha2: 'US', __typename: 'Country' },
-            { name: 'Uruguay', alpha2: 'UY', __typename: 'Country' },
+            { name: 'United States of America', id: 'US', __typename: 'Country' },
+            { name: 'Uruguay', id: 'UY', __typename: 'Country' },
           ]);
         });
       });