Create agent artifacts page

What does this MR do and why?

Create agent artifacts page

• Created agent_artifacts_page feature flag
• Created agent_artifacts controllers for project and group
• Created Vue app for agent artifacts page

This change is behind the new agent_artifacts_page FF.

References

Related to #592473

Screenshots or screen recordings

Page	After
Project
Group

How to set up and validate locally

1. Create an Ultimate group/project
2. In rails console enable the feature flag

   Feature.enable(:agent_artifacts_page)

3. Visit group page with http://127.0.0.1:3000/groups/<group-path>/-/security/agent_artifacts
4. Visit project page with http://127.0.0.1:3000/<project-path>/-/security/agent_artifacts

MR acceptance checklist

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