Change errors.Cause to errors.Is, because github.com/cockroachdb/errors
New() function create a error with error stack with depth 1, but
github.com/pkg/errors's New() function create error with no depth.
Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>
From 1.18.1, Velero adds some default affinity in the backup/restore pod,
so we can't directly compare the whole affinity,
but we can verify if the expected affinity is contained in the pod affinity.
Signed-off-by: Xun Jiang <xun.jiang@broadcom.com>