Add workflow to copy labels from linked issues to the PR

Signed-off-by: Kunal Kotwani <kkotwani@amazon.com>

.github/workflows/copy-linked-issue-labels.yml

@@ -0,0 +1,21 @@
+name: Copy labels from linked issues
+on:
+  pull_request_target:
+    types: [opened, edited, review_requested, synchronize, reopened, ready_for_review]
+
+jobs:
+  copy-issue-labels:
+    if: github.repository == 'opensearch-project/OpenSearch'
+    runs-on: ubuntu-latest
+    permissions:
+      issues: read
+      contents: read
+      pull-requests: write
+    steps:
+      - name: copy-issue-labels
+        uses: michalvankodev/copy-issue-labels@v1.3.0
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          labels-to-exclude: |
+            untriaged
+            triaged