fix: make GetProbes ordering deterministic to fix flaky test

- Add secondary sort keys (created_at, id) to GetProbes query
- Set distinct timestamps on test probes to ensure predictable order

Author: ravisuhag

internal/store/postgres/asset_repository.go

@@ -465,7 +465,7 @@ func (r *AssetRepository) GetProbes(ctx context.Context, assetURN string) ([]ass
 	query, args, err := sq.Select(
 		"id", "asset_urn", "status", "status_reason", "metadata", "timestamp", "created_at",
 	).From("asset_probes").
-		OrderBy("timestamp DESC").
+		OrderBy("timestamp DESC", "created_at DESC", "id DESC").
 		Where(sq.Eq{"asset_urn": assetURN}).
 		PlaceholderFormat(sq.Dollar).
 		ToSql()

internal/store/postgres/asset_repository_test.go

@@ -1409,12 +1409,14 @@ func (r *AssetRepositoryTestSuite) TestGetProbes() {
 		p2 := asset.Probe{
 			Status:       "FAILED",
 			StatusReason: "sample error",
+			Timestamp:    time.Now().UTC().Add(2 * time.Minute),
 			Metadata: map[string]interface{}{
 				"bar": "foo",
 			},
 		}
 		p3 := asset.Probe{
-			Status: "RUNNING",
+			Status:    "RUNNING",
+			Timestamp: time.Now().UTC().Add(1 * time.Minute),
 		}
 
 		_, err := r.repository.Upsert(r.ctx, r.ns, &ast)