Better error Messages

[Vad1mo]

When a command fails, in this case became the project isn't empty the output error message can be improved with a much better repsonse for the user to knwo what is actually going on.

# project not empty 
/bin/harbor project delete elliot
ERRO[0000] failed to delete project: [DELETE /projects/{project_name_or_id}][412] deleteProjectPreconditionFailed  &{Errors:[0x140004a2020]} 

# project does not exist

/bin/harbor project delete elliot --force
ERRO[0000] failed to list repositories: [GET /projects/{project_name}/repositories][404] listRepositoriesNotFound  &{Errors:[0x140002ef560]} 
ERRO[0000] failed to delete project: [GET /projects/{project_name}/repositories][404] listRepositoriesNotFound  &{Errors:[0x140002ef560]}