Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1162143
Description of problem:
The template combinations provide a relation between hostgroup or environment and the template. Currently only retrieval of combinations is possible by specifying the template_id:

GET /api/v2/config_templates/:config_template_id/template_combinations

There are no API requests available to search per hostgroup_id or environment_id

This makes it complex to retrieve all combinations from the hostgroup to templates to analyse which combinations are existing.

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