Port #1341 to dtq-dev-9-base: Autolabel for new issues (#1341)

Source: 882904b (dtq-dev PR #1341)

Adds `.github/workflows/new_issue_label.yml`, the `issues: [opened]` workflow that
calls `dataquest-dev/gh-actions/start@main` to auto-label newly opened issues.

Pure parity pick: the FE 9-base branch already carries the identical workflow
(dspace-angular 2b87775fe7), only BE 9-base was missing it. GitHub runs `issues`
events exclusively from the repository's default branch (`dtq-dev`), so the copy
on `dtq-dev-9-base` is inert today; it exists so a future 9-base -> dtq-dev merge
does not delete the workflow.

Cherry-picked with no conflict; the blob is byte-identical with `origin/dtq-dev`
(e9fcf70).

Co-authored-by: Matus Kasak <matus.kasak@dataquest.sk>
(cherry picked from commit 882904b)

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: 2 people

.github/workflows/new_issue_label.yml

@@ -0,0 +1,18 @@
+name: Auto Label New Issues
+
+on:
+  issues:
+    types: [opened]
+
+jobs:
+  label-issue:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+      - name: Auto Label
+        uses: dataquest-dev/gh-actions/start@main
+
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}