Integrate gitlab-ci/remove-dynamic-job-generation

Commit: seco-ne/yocto/infrastructure/gitlab-ci@897ba059

Manifest integration: remove dynamic job generation

The dynamic job was only necessary because GitLab did not expand variables in the "trigger:project" keyword: https://gitlab.com/gitlab-org/gitlab/-/issues/347469

This has been fixed in GitLab 15.3, so we don't need it anymore: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/92346