Show abuse report details

What does this MR do and why?

Resolves https://gitlab.com/gitlab-org/modelops/anti-abuse/team-tasks/-/issues/157?work_item_id=125616361 as part of https://gitlab.com/gitlab-org/modelops/anti-abuse/team-tasks/-/issues/157+

To maintain feature-parity between existing and updated abuse reports list page implementation before https://gitlab.com/gitlab-org/modelops/anti-abuse/team-tasks/-/issues/158+ is completed this MR updates each abuse report row in the list page to display the following:

1. The report's message
2. The reported user's created_at
3. The report's created_at (when the list is NOT sorted by updated_at) and updated_at (when the list is sorted by updated_at).

existing abuse reports list page for reference

Screenshots or screen recordings

Screen_Recording_2023-03-23_at_4.43.25_PM

How to set up and validate locally

1. Enable the feature flag

   $ rails console
   > Feature.enable(:abuse_reports_list)

2. Login with an admin account

3. Go to the Abuse Reports page (http://localhost:3000/admin/abuse_reports)

4. Validate that for each report row the following details are displayed (see demo above for reference):

   1. The report's message
   2. The reported user's created_at
   3. The report's created_at (when the list is NOT sorted by updated_at) and updated_at (when the list is sorted by updated_at).

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.