Allow deleting access review campaigns in any status

Drop the backend status gate on campaign delete and show delete in
the console whenever the user has delete permission, regardless of
whether the campaign is draft, in progress, or completed.

Signed-off-by: Cursor Agent <cursoragent@cursor.com>

Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>

pkg/accessreview/errors_test.go

@@ -57,15 +57,6 @@ func TestCampaignClientErrors(t *testing.T) {
 			wantText: fmt.Sprintf("access review campaign %q is not in draft", campaignID),
 			sentinel: accessreview.ErrCampaignNotDraft,
 		},
-		{
-			name: "not deletable",
-			err:  accessreview.NewCampaignNotDeletableError(campaignID),
-			wantText: fmt.Sprintf(
-				"access review campaign %q cannot be deleted unless it is draft, cancelled, or completed",
-				campaignID,
-			),
-			sentinel: accessreview.ErrCampaignNotDeletable,
-		},
 		{
 			name: "not pending actions",
 			err:  accessreview.NewCampaignNotPendingActionsError(campaignID),