Task/read from last used

[jzbahrai]

Summary | Résumé

We want to store the last time an api_key is used in the api_key table.
Changes made:

1. Add a function to update the api key last used timestamp
2. Update persist_notification and persist_notifications to store the last_used_timestamp
3. Change the get_last_used api_key to use the last_used_timestamp from the api_key table

Testing locally

1. Run the migration to add the last_used column (its on main already)
2. Check the api_key table for one of your services
3. Send a message using an api_key, in your database you should see the last_used_timestamp for the api_key to be populated

https://app.zenhub.com/workspaces/notify-planning-614b3ad91bc2030015ed22f5/issues/gh/cds-snc/notification-planning/1413

[andrewleith]

LGTM - tested locally and works as descibed.

This should be a LOT faster! Nice work! 🎉 ⏩