Update Manage Purchases page to indicate presence of Ultimate trial

Background

Today, GitLab.com Premium customers are only able to trial Ultimate on a new namespace, separate from their primary group. This does not allow them to fully validate Ultimate features within their existing workflows. In order to drive Ultimate adoption and increase ARR, we would like to introduce the ability for existing Premium GitLab.com customers to experience a 30-day Ultimate trial on their existing namespace.

Proposal

Update the customer's view in CDot on the Manage Purchases page to have an indicator that a subscription/group is currently on a trial.