feat: Enhance selection status logic for campaign preview based on role

[Kariamos]

…er roles

[github-actions]

Tests difference:

New Tests

< User role = administrator - Should answer with selectionStatus = ready
< User role = tester - Should answer with selectionStatus = complete
< User role = tester with appq_campaign olp - Should answer with selectionStatus = ready

Removed Tests

> There is no candidature - Should answer without selectionStatus
> With accepted = 0 - Should not answer with selectionStatus
> With results = 0 - Should answer with selectionStatus = starting
> With results = 1 - Should answer with selectionStatus = excluded
> With results = 2 - Should answer with selectionStatus = ready
> With results = 3 - Should answer with selectionStatus = complete