Add package for Ubuntu 26.04 (resolute)
<!-- Read me first! Before you create a new issue, please make sure to search in https://gitlab.com/gitlab-org/omnibus-gitlab/issues, to verify that the issue you are about to submit isn't a duplicate. --> ### Summary The latest LTS version of Ubuntu (26.04/resolute) has just been released. It would be good to have GitLab packages built for it as people start upgrading (in the meantime the noble packages seem to work fine). ### Proposal <!-- Describe the problem you are trying to solve Benefits if the feature existed. End result of the proposed feature. --> - Provide packages for Ubuntu 26.04 resolute. ### References Equivalent proposal from 24.04: https://gitlab.com/gitlab-org/omnibus-gitlab/-/work_items/8509
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