ci: We shouldn’t be able to release on PyPI on the main branch without a tag

Keeping this possibility for PyPI_test job since it’s for testing purposes

.gitlab-ci.yml

@@ -151,9 +151,6 @@ release:
   rules:
     - if: $CI_COMMIT_TAG
       when: manual
-    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-      when: manual
-    - when: never
 
 release_test:
   stage: release