`oc-mirror` does not work as expected relative path for OCI format copy

This is a clone of issue OCPBUGS-4516. The following is the description of the original issue:
—
Description of problem
`oc-mirror` does not work as expected with relative path for OCI format copy

How reproducible:
always

Steps to Reproduce:
Copy the operator image with OCI format to localhost with relative path my-oci-catalog;
cat imageset-copy.yaml
kind: ImageSetConfiguration
apiVersion: mirror.openshift.io/v1alpha2
mirror:
operators:

• catalog: registry.redhat.io/redhat/redhat-operator-index:v4.12
  packages:
• name: aws-load-balancer-operator

`oc mirror --config imageset-copy.yaml --use-oci-feature --oci-feature-action=copy oci://my-oci-catalog`

Actual results:
2. will create a dir with name : my-file-catalog , but no use for user specified dir: my-oci-catalog
ls -tl
total 20
drwxr-xr-x. 3 root root 4096 Dec 6 13:58 oc-mirror-workspace
drwxr-xr-x. 3 root root 4096 Dec 6 13:58 olm_artifacts
drwxr-x---. 3 root root 4096 Dec 6 13:58 my-file-catalog
drwxr-xr-x. 2 root root 4096 Dec 6 13:58 my-oci-catalog
rw-rr-. 1 root root 206 Dec 6 12:39 imageset-copy.yaml

Expected results:
2. Use the user specified directory .

Additional info:
``oc-mirror --config config-operator.yaml oci:///home/ocmirrortest/noo --use-oci-feature --oci-feature-action=copy` with full path works well.