fix: Enable sessions-e2e workflow trigger

The workflow trigger was commented out, making the workflow invalid.
GitHub Actions requires at least one trigger event to be configured.

Uncomment the 'on:' section to enable the workflow to run on:
- Pull requests to main and release branches
- Changes in src/vs/sessions/** or scripts/code-sessions-web.* paths

This fixes the workflow parse error that was preventing the PR from running tests.

Author: rupeshkumar-555

.github/workflows/sessions-e2e.yml

@@ -1,13 +1,13 @@
 name: Sessions E2E Tests
 
-# on:
-#   pull_request:
-#     branches:
-#       - main
-#       - 'release/*'
-#     paths:
-#       - 'src/vs/sessions/**'
-#       - 'scripts/code-sessions-web.*'
+on:
+  pull_request:
+    branches:
+      - main
+      - 'release/*'
+    paths:
+      - 'src/vs/sessions/**'
+      - 'scripts/code-sessions-web.*'
 
 permissions:
   contents: read