Remove unused action

.github/workflows/issues.yml

@@ -1,20 +0,0 @@
-name: Milestone Labeler
-on:
-  issues:
-    types: [milestoned]
-permissions:
-  contents: read
-
-jobs:
-  apply_labels:
-    permissions:
-      issues: write  # for andymckay/labeler to label issues
-      pull-requests: write  # for andymckay/labeler to label PRs
-    runs-on: ubuntu-latest
-    steps:
-      - name: Add track-internal
-        uses: andymckay/labeler@1.0.4
-        if: github.event.issue.pull_request == null
-        with:
-          repo-token: ${{ secrets.Github_Token }}
-          add-labels: "track-internal"