Smoke test lifecycle changes (#137969)

* rewrite teardown

* 💄

* avoid spam errors

* 💄

* split spawning browser from electron

* await copyExtension

* cleanup

* refactor methods

* cleanup

* cleanup

* cleanup

* 🆙 deps

test/smoke/package.json

@@ -14,7 +14,7 @@
     "mkdirp": "^1.0.4",
     "ncp": "^2.0.0",
     "node-fetch": "^2.6.1",
-    "rimraf": "^2.6.1",
+    "rimraf": "3.0.2",
     "vscode-test": "^1.6.1"
   },
   "devDependencies": {
@@ -23,7 +23,7 @@
     "@types/ncp": "2.0.1",
     "@types/node": "14.x",
     "@types/node-fetch": "^2.5.10",
-    "@types/rimraf": "^2.0.4",
+    "@types/rimraf": "3.0.2",
     "npm-run-all": "^4.1.5",
     "typescript": "^4.3.2",
     "watch": "^1.0.2"