[Harbor] VCH should not retry pulling when registry returns 4xx

[reasonerjt]

This is another finding along #5950

When the image doesn't match the project level policy, Harbor will return 412 for the "GET manifest" request. After receiving 412 VCH keeps retrying 5 times, so it will take around a minute for the "pull" action to really fail.

Generally, I don't think VCH should retry upon receiving a 4xx error code from server. It probably should fail right away except for receiving a 401.