fix: remove undici dependency and clean up ProxyManager code (#6020)

package.json

@@ -87,7 +87,6 @@
     "fast-xml-parser": "^5.2.0",
     "fetch-socks": "^1.3.2",
     "fs-extra": "^11.2.0",
-    "go-get-folder-size": "^0.5.5",
     "got-scraping": "^4.1.1",
     "jsdom": "^26.0.0",
     "markdown-it": "^14.1.0",
@@ -100,7 +99,6 @@
     "tar": "^7.4.3",
     "turndown": "^7.2.0",
     "turndown-plugin-gfm": "^1.0.2",
-    "undici": "^7.4.0",
     "webdav": "^5.8.0",
     "ws": "^8.18.1",
     "zipread": "^1.3.3"