The utility of SafeErrWrapperBuilder is low. Let us instead change the
code to always create ErrWrapper when we're in this package.
While there, also note some TODO-next items.
Part of https://github.com/ooni/probe/issues/1505.
* refactor(errorsx): start hiding private details and moving around stuff
Part of https://github.com/ooni/probe/issues/1505
* fix: remove now-addressed todo comments