Description of problem:

Misleading error while exporting a content view version in a Syncable format for Docker/Ansible type repository

Version-Release number of selected component (if applicable):
Satellite 6.13

How reproducible:
Always

Steps to Reproduce:

1. Login to the Satellite WebUI
2. Create a custom container repository with "docker type"
3. Ensure to change the download policy of the container repository to immediate
4. Sync the container repository
5. Create a Content view and add the container repository
5. Publish the Content view version
7. Login to the Satellite CLI and export the CV version as follows:

Actual results:

1. hammer content-export complete version --content-view="CV" --version=1.0 --organization="RedHat" --format=syncable
   [..........................................................................................................................................................................................................] [100%]
   Unable to access/write to '/var/lib/pulp/exports/RedHat/CV/1.0/2023-02-06XYZ-03-58-05-30'. Generated '/var/lib/pulp/exports/RedHat/metadata-11.json' instead. This file is necessary to perform an import.

Expected results:

An error/warning message saying Docker/Ansible repository type are not supported for syncable format.