Introduce basic actions to alert list view
Problem to solve
If users are triaging a large list of alerts with a team, they will need some way of letting their team members know that particular alerts are being looked at, so that nothing slips through the cracks.
Give users an easy way of changing the status of an alert directly within the GitLab UI, so users can let their team members know that they are investigating an alert:
Current proposal is to have that status options be triggered, acknowledged, ignored and resolved.
It's possible that we can break this down further into separate iterations. For example, perhaps ignored could be added as part of a later iteration?
Out of scope for this issue: syncing the status back to the external tool that originally reported the alert.