ci: Remove manually triggered test-ci job

This doesn't work on slimmed down pipelines as the needed jobs don't
exist.

If you want to run test-primops then apply the label.

.gitlab-ci.yml

@@ -848,10 +848,6 @@ release-hackage-lint:
       artifacts: false
   extends: .test-primops
 
-test-primops-validate:
-  extends: .test-primops-validate-template
-  when: manual
-
 test-primops-label:
   extends: .test-primops-validate-template
   rules: