Fixes#9704
As we do want to unify error handling, so just decreprates pkg errors, use lib/errors instead for Harbor internal used errors model.
1, The lib/errors can cover all of funcs of pkg/errors, and also it has code attribute to define the http return value.
2, lib/errors can give a OCI standard error format, like {"errors":[{"code":"UNAUTHORIZED","message":"unauthorized"}]}
If you'd like to use pkg/errors, use lib/errors instead. If it cannot meet your request, enhance it.
Signed-off-by: wang yan <wangyan@vmware.com>
