remove most usages of node-fetch

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

plugins/devtools-backend/package.json

@@ -55,7 +55,6 @@
     "express-promise-router": "^4.1.0",
     "fs-extra": "^11.0.0",
     "lodash": "^4.17.21",
-    "node-fetch": "^2.7.0",
     "ping": "^0.4.1",
     "semver": "^7.5.3",
     "yn": "^4.0.0"

plugins/devtools-backend/src/api/DevToolsBackendApi.ts

@@ -24,9 +24,7 @@ import {
   ExternalDependencyStatus,
   PackageDependency,
 } from '@backstage/plugin-devtools-common';
-
 import { JsonObject } from '@backstage/types';
-import fetch from 'node-fetch';
 import { findPaths } from '@backstage/cli-common';
 import { getPackages } from '@manypkg/get-packages';
 import ping from 'ping';