There are Eclipse Che testing pipelines to migrate to CRW CSB Jenkins:

• Eclipse Che nightly tests pipelines on OCP:
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/OCP/job/install-che-using-chectl/
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/OCP/job/uninstall-che/
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/nightly/job/che-chectl-tls-oauth/
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/nightly/job/che-chectl-tls-no-oauth/
• Eclipse Che PR check pipeline
• Che-theia PR check pipeline
• Eclipse Che nightly tests pipelines on minikube:
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/nightly/job/Multihost-MultiUser-Che-nightly-check-e2e-tests-against-k8s/ 
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/nightly/job/Singlehost-MultiUser-Che-nightly-check-e2e-tests-against-k8s/ 
  • https://codeready-workspaces-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/view/che-regular-tests/view/basic/job/basic-MultiUser-Che-check-e2e-tests-against-k8s/

Update: here an example of configuring GitHub Pull Request Builder plugin:
[1] https://gitlab.cee.redhat.com/fuse-infrastructure/cci-jd-declaration-fuse/-/commit/2eadb9dbc3af4d031b87eabd69ac5ad5b7d4ff08
[2] https://gitlab.cee.redhat.com/fuse-infrastructure/cci-jd-declaration-fuse/-/commit/a2e5c32c6d81fb635ac31bd730ac99dab498205f

CasC support of GitHub Pull Request Builder plugin hasn't been completely implemented: https://projects.engineering.redhat.com/browse/CCITJEN-81