Mark failed evidence descriptions instead of retrying

Previously the worker reset failed descriptions back to PENDING,
causing infinite retry loops for permanently broken evidence.
Add a FAILED status so these items stop cycling and can be
investigated.

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

pkg/coredata/evidence_description_status.go

@@ -27,6 +27,7 @@ const (
 	EvidenceDescriptionStatusPending    EvidenceDescriptionStatus = "PENDING"
 	EvidenceDescriptionStatusProcessing EvidenceDescriptionStatus = "PROCESSING"
 	EvidenceDescriptionStatusCompleted  EvidenceDescriptionStatus = "COMPLETED"
+	EvidenceDescriptionStatusFailed     EvidenceDescriptionStatus = "FAILED"
 )
 
 func (s EvidenceDescriptionStatus) MarshalText() ([]byte, error) {
@@ -43,6 +44,8 @@ func (s *EvidenceDescriptionStatus) UnmarshalText(data []byte) error {
 		*s = EvidenceDescriptionStatusProcessing
 	case EvidenceDescriptionStatusCompleted.String():
 		*s = EvidenceDescriptionStatusCompleted
+	case EvidenceDescriptionStatusFailed.String():
+		*s = EvidenceDescriptionStatusFailed
 	default:
 		return fmt.Errorf("invalid EvidenceDescriptionStatus value: %q", val)
 	}

pkg/coredata/migrations/20260326T150000Z.sql

@@ -0,0 +1 @@
+ALTER TYPE evidence_description_status ADD VALUE IF NOT EXISTS 'FAILED';