test: drop now-empty remote runner (#35343)

* test: drop the now-empty remote runner from CI

* move fixtures to spec-main

* remove remote runner

* fix stuff

* remove global-paths hack

* move ts-smoke to spec/

* fix test after merge

* rename spec-main to spec

* no need to ignore spec/node_modules twice

* simplify spec-runner a little

* no need to hash pj/yl twice

* undo lint change to verify-mksnapshot.py

* excessive ..

* update electron_woa_testing.yml

* don't search for test-results-remote.xml

it is never produced now

spec/fixtures/extensions/persistent-background-page/background.js

@@ -0,0 +1 @@
+/* eslint-disable no-undef */

spec/fixtures/extensions/persistent-background-page/manifest.json

@@ -0,0 +1,9 @@
+{
+  "name": "persistent-background-page",
+  "version": "1.0",
+  "background": {
+    "scripts": ["background.js"],
+    "persistent": true
+  },
+  "manifest_version": 2
+}