Add Codespace lifecycle telemetry tracking

Replicates the tracking setup from mongodb-developer/mean-stack-example:
.devcontainer/track.sh plus postCreateCommand/postStartCommand hooks that
best-effort report created/started events to the shared codespace-telemetry
function. Appended with || true so telemetry can never break the dev
environment.

Author: sis0k0

.devcontainer/devcontainer.json

@@ -28,8 +28,8 @@
     }
   },
 
-  "postCreateCommand": "cd mern/server && npm ci && cd ../client && npm ci",
-  "postStartCommand": "bash .devcontainer/startup.sh",
+  "postCreateCommand": "cd mern/server && npm ci && cd ../client && npm ci && bash /workspaces/mern-stack-example/.devcontainer/track.sh created || true",
+  "postStartCommand": "bash .devcontainer/startup.sh; bash /workspaces/mern-stack-example/.devcontainer/track.sh started || true",
 
   // this will open 3 bash sessions, each one running the specified command
   "postAttachCommand": {

.devcontainer/track.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+# Best-effort telemetry: log a codespace lifecycle event. Never fails the caller.
+EVENT="${1:-unknown}"
+GIT_EMAIL="$(git config --get user.email 2>/dev/null || true)"
+URL="https://us-central1-project-learning-fuel.cloudfunctions.net/trackCodespace"
+curl -fsS -m 5 -X POST "$URL" \
+  -H "Content-Type: application/json" \
+  -d "{\"event\":\"$EVENT\",\"codespace\":\"${CODESPACE_NAME:-}\",\"user\":\"${GITHUB_USER:-}\",\"gitEmail\":\"${GIT_EMAIL:-}\",\"repository\":\"${GITHUB_REPOSITORY:-mongodb-developer/mern-stack-example}\"}" \
+  >/dev/null 2>&1 || true