chore(e2e): downgrade to wdio v8

- Downgrades WebdriverIO and relevant packages from v9 to v8

There is an incompatibility between WebdriverIO v9 and the "wdio-vscode-service" package. While the
tests execute successfully, there are type-related issues between the two packages. Additionally,
there may be other underlying issues that have not yet been identified.

We can upgrade back to WebdriverIO v9 once the "wdio-vscode-service" package updates its peer
dependencies to support it.

Relevant PR: webdriverio-community/wdio-vscode-service#130
Relevant Issue: webdriverio-community/wdio-vscode-service#140

Signed-off-by: Zacharias Fragkiadakis <zacfragkiadakis@gmail.com>

package.json

@@ -50,7 +50,7 @@
     "test:typings:extension": "tsc --noEmit",
     "test:typings:webviews": "cd ./src/webviews && npm run type-check",
     "test:unit": "echo \"Unit testing not yet implemented.\"",
-    "test:e2e": "wdio run ./test/e2e/wdio.conf.ts"
+    "test:e2e": "TS_NODE_PROJECT=test/e2e/tsconfig.wdio.json wdio run ./test/e2e/wdio.conf.ts"
   },
   "main": "./dist/extension.js",
   "activationEvents": [
@@ -584,34 +584,28 @@
     "@types/mocha": "^10.0.9",
     "@types/node": "^20.11.21",
     "@types/vscode": "^1.91.0",
-    "@wdio/cli": "^9.2.11",
-    "@wdio/globals": "^9.2.11",
-    "@wdio/local-runner": "^9.2.11",
-    "@wdio/mocha-framework": "^9.2.8",
-    "@wdio/spec-reporter": "^9.2.8",
-    "@wdio/types": "^9.2.2",
+    "@wdio/cli": "^8.41.0",
+    "@wdio/globals": "^8.41.0",
+    "@wdio/local-runner": "^8.41.0",
+    "@wdio/mocha-framework": "^8.41.0",
+    "@wdio/spec-reporter": "^8.41.0",
+    "@wdio/types": "^8.41.0",
     "esbuild": "^0.23.0",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^8.10.0",
     "eslint-plugin-jasmine": "^4.2.2",
     "eslint-plugin-prettier-vue": "^4.2.0",
     "eslint-plugin-tailwindcss": "^3.14.3",
     "eslint-plugin-vue-scoped-css": "^2.7.2",
-    "expect-webdriverio": "^5.0.4",
     "npm-run-all": "^4.1.5",
     "simple-git-hooks": "^2.9.0",
+    "ts-node": "^10.9.2",
     "ts-xor": "^1.3.0",
-    "tsx": "^4.19.2",
     "typescript": "^5.3.3",
     "wdio-vscode-service": "^6.1.2",
-    "webdriverio": "^9.2.11",
+    "webdriverio": "^8.41.0",
     "zx": "^8.1.9"
   },
-  "overrides": {
-    "wdio-vscode-service": {
-      "webdriverio": "^9.2.11"
-    }
-  },
   "simple-git-hooks": {
     "pre-commit": "npm run lint"
   },