Add support for OCP 4.18 and make it the default #4881

Job	Run time
call-terraform-ci-pipeline / notify_requirements / Notify-Contributor-Requirements	0s
call-terraform-ci-pipeline / start-pipeline	0s
call-terraform-ci-pipeline / set-commit-status-ci-running	0s
call-terraform-ci-pipeline / set-commit-status-infra-running	0s
call-terraform-ci-pipeline / trigger_ci	0s
call-terraform-ci-pipeline / trigger_infra_tests	0s
call-terraform-ci-pipeline / set-commit-status-ci-success	0s
call-terraform-ci-pipeline / set-commit-status-ci-failure	0s
call-terraform-ci-pipeline / set-commit-status-infra-success	-1s
call-terraform-ci-pipeline / set-commit-status-infra-failure	-1s
	-2s

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