Added source and user marks to opportunities type. Any ignored errors are deferred to //nolint with a comment instead of being silently dropped

internal/mock/findATender/catalog.go

@@ -185,7 +185,7 @@ func clone[T any](v T) T {
 	var out T
 	b, err := json.Marshal(v)
 	if err == nil {
-		_ = json.Unmarshal(b, &out)
+		json.Unmarshal(b, &out) //nolint:errcheck,gosec // b was just marshalled from a T
 	}
 	return out
 }