Use catalog_name if defined

[bchaillou-ovh]

Description

This PR is a request from Webhosting Infra team:

• Add catalog_name on order_cart (for OptionsPlan). Unit tests updated.

Type of change

• [X] Improvement (improve existing resource(s) or datasource(s))
• [X] Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

It is difficult to test by doing an acceptance test. You should contact Yoann Normand from the Webhosting Infra team who took care to make a manually tested.

[bchaillou-ovh]

Example updated with catalog_name.

[amstuta]

Closing this request for inactivity, don't hesitate to re-open it if catalog_name field goes public.