fix(e2e): update test extension

- add new info message when extension loads
- prefix vscode_proxy_uri message with "proxyUri:" to make it easier to
  find in e2e test
- activate extension onStartupFinished

Author: jsjoeio

test/e2e/extensions/test-extension/extension.ts

@@ -1,10 +1,11 @@
 import * as vscode from "vscode"
 
 export function activate(context: vscode.ExtensionContext) {
+  vscode.window.showInformationMessage("test extension loaded")
   context.subscriptions.push(
     vscode.commands.registerCommand("codeServerTest.proxyUri", () => {
       if (process.env.VSCODE_PROXY_URI) {
-        vscode.window.showInformationMessage(process.env.VSCODE_PROXY_URI)
+        vscode.window.showInformationMessage(`proxyUri: ${process.env.VSCODE_PROXY_URI}`)
       } else {
         vscode.window.showErrorMessage("No proxy URI was set")
       }

test/e2e/extensions/test-extension/package.json

@@ -4,7 +4,7 @@
   "version": "0.0.1",
   "publisher": "coder",
   "activationEvents": [
-    "onCommand:codeServerTest.proxyUri"
+    "onStartupFinished"
   ],
   "engines": {
     "vscode": "^1.56.0"