Align on usage of cross-fetch vs node-fetch in frontend vs backend packages

Signed-off-by: Fredrik Adelöw <freben@gmail.com>

plugins/techdocs-backend/src/search/DefaultTechDocsCollator.ts

@@ -17,7 +17,7 @@
 import { PluginEndpointDiscovery } from '@backstage/backend-common';
 import { Entity, RELATION_OWNED_BY } from '@backstage/catalog-model';
 import { DocumentCollator } from '@backstage/search-common';
-import fetch from 'cross-fetch';
+import fetch from 'node-fetch';
 import unescape from 'lodash/unescape';
 import { Logger } from 'winston';
 import pLimit from 'p-limit';

plugins/techdocs-backend/src/service/router.ts

@@ -24,7 +24,7 @@ import {
   PreparerBuilder,
   PublisherBase,
 } from '@backstage/techdocs-common';
-import fetch from 'cross-fetch';
+import fetch from 'node-fetch';
 import express, { Response } from 'express';
 import Router from 'express-promise-router';
 import { Knex } from 'knex';