feat: include label in PR creation (#23380)

This includes the `translation-batch` label when a new PR is created for a translation batch: https://github.com/github/docs-internal/issues?q=label%3Atranslation-batch+

.github/workflows/create-translation-batch-pr.yml

@@ -162,7 +162,8 @@ jobs:
           gh pr create --title "New translation batch for ${{ matrix.language }}" \
             --base=main \
             --head=${{ steps.set-branch.outputs.BRANCH_NAME }} \
-            --body-file /tmp/pr-body.txt || git push origin :${{ steps.set-branch.outputs.BRANCH_NAME }}
+            --body-file /tmp/pr-body.txt || git push origin :${{ steps.set-branch.outputs.BRANCH_NAME }} \
+            --label "translation-batch"
 
       # When the maximum execution time is reached for this job, Actions cancels the workflow run.
       # This emits a notification for the first responder to triage.