Display group metadata in CICD admin pages

What does this MR do and why?

Introduce read_group_metadata ability to grant users minimal read access to a group's information.

This ability can be granted to users to allow them to see minimal information about a group (e.g. name, avatar) even without membership to the group (membership grants read_group ability).

read_group_metadata is currently enabled for a user when any of the following conditions are met:

• user can read_group
• user can read_admin_cicd - purpose: so the user can see minimal information for groups (the user is not a member of) associated with group runners

References

Adjust views so that only allowed components an... (#525077 - closed)

Screenshots or screen recordings

Page	header	Note
Group runners list		Since the user does not have read_group ability on the runner group, the group name is not rendered as a link
Group runner show		Since the user does not have read_group ability on the runner group, the group avatar and name are not rendered as a links

How to set up and validate locally

1. Enable feature flag

   $ rails c
   > Feature.enable(:custom_admin_roles)

2. Create a new admin member role with read_admin_cicd permission enabled

   > admin_member_role = MemberRole.create(name: 'Test', description: 'Test', read_admin_cicd: true)

3. Assign the new admin role to a non-admin user

   > user = User.find(<a_user_id>)
   > Users::UserMemberRole.create(member_role: admin_member_role, user: user)`

4. Login with the user
5. Click global search in left sidebar ("Search or go to"). Click "Admin area" menu item.
6. In /admin/runners page, click on Groups tab to see group runners
7. Verify that runners assigned to a group the user is not a member of displays the group's name as plain text instead of a link
   Click to expand

   
8. Visit a runner assigned to a group the user is not a member
9. Verify that the names and avatars of assigned groups the user the user is not a member of are displayed as plain text instead of a link
   Click to expand

   

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