[AF-33] Set up the end of the auction

[ricardopacheco]

Summary 🔴

Setting up the auction completion involves defining the parameters and conditions that govern the conclusion of bidding activities. We will involve the integration of a notification system (via email) to inform participants about the imminent conclusion of the auction.

Additionally, the configuration should enable post-auction procedures, such as invoicing and notifications to winners and participants. The version 0.8.6 CHANGELOG contains all the details.

Proposed / Possible solution 🔴

• For each type of existing auction, we create a specific completion operation for it.
• For standard and closed auctions, where there is no change in the end date, we only use a simple scheduling in the background job.
• For penny auctions, the end date is updated with each new bid. Therefore, once created, a date is added (according to the timer), and it is updated again with each new bid. Finalization is also done using a background job. To avoid conflicts with lots of unnecessary bidding and scheduling, we use sidekiq unique jobs to manage this.