[Reporting] CSV Job data is missing the meta.objectType field

[tsullivan]

Reporting CSV exports create documents in .reporting* that should have a standard schema.

The meta.objectType field is important for aggregations in Reporting usage data, so we can divide up metrics based the different integrating applications

Here is an example of a meta.objecType value for Canvas PDF report data:

Here it shows that CSV report data is missing the meta.objectType field:

[elasticmachine]

Pinging @elastic/kibana-reporting-services (Team:Reporting Services)

[tsullivan]

Fixed in #76566 - previously the payload created by the createJob methods was not type checked.