GCP credit is not considered in OCP on Cloud instance-types reports with group_by[project] param.

Notes:

• credit is considered for group_by[cluster], group_by[node], group_by[account], group_by[service] and group_by[region] params as well as no group_by
• all ocp on gcp reports seem to be correct

Steps to reproduce:

1. ingest OCP on GCP data with credit (you can use cost_ocp_on_gcp_source_static + cost_gcp_source_static fixtures)

2. /reports/openshift/infrastructures/gcp/instance-types/?group_by[project]=*
- GCP credit is considered (you can check /reports/gcp/instance-types/ to see credit values)

3. /reports/openshift/infrastructures/all/instance-types/?group_by[project]=*
- credit is not considered - raw values are shown instead