Enable copilot usage in PR template according to Qlik policy

Author: eskaaren

.github/pull_request_template.md

@@ -9,3 +9,7 @@
 
 # Rollback steps
  - revert this branch
+
+#### AI generated code
+https://internal.qlik.dev/general/ways-of-working/code-reviews/#guidelines-for-ai-generated-code
+- [ ] this PR has been written with the help of GitHub Copilot or another generative AI tool