bootleg224 issues

Results 2 issues of


                                            bootleg224

The code does not handle the case when Cert Flags are set and Windows is the platform and .net 5 or greater is used

size/S

cncf-cla: no

This fix corrects the case when ClientCertificateKeyStoreFlags are not used https://github.com/kubernetes-client/csharp/pull/936