Consolidate all object storage configuration: only one bucket
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Label this issue](https://contributors.gitlab.com/manage-issue?action=label&projectId=278964&issueIid=292958) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=292958) </details> <!--IssueSummary end--> This is a follow-up to https://gitlab.com/gitlab-org/gitlab/-/issues/23345 Today installing GitLab requires [up to 13 different buckets](https://docs.gitlab.com/ee/administration/object_storage.html#storage-specific-configuration), this adds a lot of friction to new installations as well as slowing down feature adoption. Thanks to [consolidated object storage configuration](https://docs.gitlab.com/ee/administration/object_storage.html#consolidated-object-storage-configuration), developed in https://gitlab.com/gitlab-org/gitlab/-/issues/23345 we now support one single credential for all the buckets. The next step will be to use just one bucket.
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