ci: re-add pr triage for labels

.github/auto_assign.yml

@@ -1,8 +0,0 @@
-addReviewers: true
-reviewers:
-  - iCrawl
-  - SpaceEEC
-  - kyranet
-  - vladfrangu
-numberOfReviewers: 0
-runOnDraft: true

.github/workflows/pr-triage.yml

@@ -0,0 +1,13 @@
+name: 'PR Triage'
+on:
+  pull_request_target:
+jobs:
+  pr-triage:
+    name: PR Triage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Automatically label PR
+        uses: actions/labeler@v4
+        with:
+          repo-token: '${{ secrets.GITHUB_TOKEN }}'
+          sync-labels: true