[GitHub Actions] Use actions/labeler (#233)

- Leverage existing labeler action for labels based on files changed.
- Change the previous workflow to run on 30 minute intervals to assign author organization membership label, to work on forked pull requests.

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

.github/workflows/labeler.yml

@@ -0,0 +1,14 @@
+name: Auto Label PR
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-24.04
+    steps:
+    - id: label-the-PR
+      uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5.0.0