Add project topics to project list UI

Problem to solve

We have a nice iteration on the project list in https://gitlab.com/gitlab-org/gitlab-ce/issues/51944. As part of this, we should consider showing project topics in the presentation for each project.

Proposal

• If a project has project topics associated with it, show them in the project list UI.
• When a project topic is clicked, search for all projects on the instance with that topic.

Links / references