Expose is_self_deletion_in_progress and is_self_deletion_scheduled on GraphQL ProjectType

Background

We want to show a badge when a project is being deleted. We also need to adjust the logic of when to show a Restore button.

Proposal

To make this happen we need access to is_self_deletion_in_progress and is_self_deletion_scheduled on the GraphQL ProjectType.

Implementation guide

See !196448 (merged)