ICSHWI-7800 Use extra_vars instead of inventory

• Get the list of IOCs to be deployed (iocs_to_deploy) from the extra_var iocs_to_deploy_json in the same format as in the inventory (name, url, version)
• Get the list of IOCs (iocs) from the extra_var extra_iocs_json overriding the inventory

An example of what iocs_to_deploy_json looks like can be found here

This MR needs this backend modification