Update Node to 22.15.0 (#24699)

* Run `bin/update_node 20.18.2 22.15.0`

* Remove expects on `fetchMock.callHistory.done()` to fix tests: are they necessary?

* Set node version to `22.x` in linked-url-proxy

* Increase test timeout to 30s in `github-sync`, Add waiting steps

* Define `navigator.onLine` in tests setup

GitOrigin-RevId: 75eb556e9f51b665e57497a0879b6915d14069ce

services/web/test/frontend/bootstrap.js

@@ -104,3 +104,8 @@ const fetchMock = require('fetch-mock').default
 fetchMock.spyGlobal()
 fetchMock.config.fetch = global.fetch
 fetchMock.config.Response = fetch.Response
+
+Object.defineProperty(navigator, 'onLine', {
+  configurable: true,
+  get: () => true,
+})