Add an issue template config for the migration (GH-32101)

Author: ezio-melotti

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: ⚠ GitHub Issues Migration in progress ⚠
+    url: https://discuss.python.org/t/github-issues-migration-status-update/14573
+    about: Check status updates on the migration