Add table headers for maven virtual registries list view
Context
To keep the registries list consistent with the upstreams list view added in Maven virtual registry Upstreams list view (#556837 - closed)
Design
#556837[MavenRegistriesList.png]
![#556837[MavenRegistriesList.png]](https://gitlab.com/gitlab-org/gitlab/-/issues/556837/designs/MavenRegistriesList.png){kind=link}
Proposal
Add table headers to the registries list view.
Edited by 🤖 GitLab Bot 🤖