Revert "feat: ✨ add readExternalIdFromOrderMetadata"

This reverts commit a78d9d4597672f8605cf998a9f784aebaab27de1.

apps/taxes/graphql/queries/FetchOrderExternalId.graphql

@@ -1,5 +0,0 @@
-query FetchOrderExternalId($orderId: ID!) {
-  order(id: $orderId) {
-    externalId: metafield(key: "externalId")
-  }
-}

apps/taxes/src/modules/app/order-metadata-manager.ts

@@ -1,6 +1,4 @@
 import {
-  FetchOrderExternalIdDocument,
-  FetchOrderExternalIdQuery,
   UpdateMetadataDocument,
   UpdateMetadataMutation,
   UpdateMetadataMutationVariables,
@@ -37,16 +35,4 @@ export class OrderMetadataManager {
 
     return { ok: true };
   }
-
-  async readExternalIdFromOrderMetadata(orderId: string) {
-    const { error, data } = await this.client
-      .query<FetchOrderExternalIdQuery>(FetchOrderExternalIdDocument, { id: orderId })
-      .toPromise();
-
-    if (error) {
-      throw error;
-    }
-
-    return data?.order?.externalId;
-  }
 }