Add `Allowed to delete projects` setting for groups
### Problem to solve Currently, at the group level, we have the `Allowed to create projects` setting. It would be nice to have an `Allowed to delete projects` setting at the group level. This would allow group owners to let group members with a role of `Maintainer` delete projects. ### Links / references Customer ticket -> https://gitlab.zendesk.com/agent/tickets/100097 (internal use) /cc @jeremy\_
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