ci: label web changes (#31261)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

.github/labeler.yml

@@ -0,0 +1,3 @@
+web:
+  - changed-files:
+      - any-glob-to-any-file: 'web/**'

.github/workflows/labeler.yml

@@ -0,0 +1,14 @@
+name: "Pull Request Labeler"
+on:
+  pull_request_target:
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v6
+        with:
+          sync-labels: true