.gitlab-ci.yml: move coverage analysis to the end, set it manual
See #3339 (closed). We want to have first fast tests. Once we will have #3340, we will run again always this stage.
GitLab upgrade completed. Current version is 18.5.4
https://about.gitlab.com/releases/2025/09/18/gitlab-18-4-released/
https://about.gitlab.com/releases/2025/10/16/gitlab-18-5-released/
See #3339 (closed). We want to have first fast tests. Once we will have #3340, we will run again always this stage.