Fix personal projects signed out state on user profile

What does this MR do and why?

In &9056 we are migrating the user profile from HAML/jQuery to Vue. The Personal projects section uses the GET /users/:user_id/projects API to fetch the projects. When signed out this API only returns BasicProjectDetails so we need to add a few conditionals to the projects_list_item.vue to prevent errors. This MR adds a conditional for rendering updated_at and visibility attributes.

Reviewer note: There is currently another bug on the Vue version of the profile where the followers/following API return 401 when signed out. This error will be solved by #412929.

UX note: There is currently an incorrect bottom border in the tabs. This is due to a recent change in !118597 (merged). We will be removing the tabs and moving the navigation into the new sidebar in #389842. By removing the tabs we will be able to fix this bug and because this is behind a feature flag I am going to leave it as-is for now.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Create a personal project
   • Create a project and choose your username for the namespace
2. Enable the profile_tabs_vue feature flag
   • bin/rails console
   • Feature.enable(:profile_tabs_vue)
3. In a private/incognito window visit your profile. There should be no console errors.

MR acceptance checklist

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