Set collectedfrom to OpenAIRE in all the relations exported by the IIS

[marekhorst]

Originally requested in: https://support.openaire.eu/issues/10050.

The goal is to add to all IIS-exported relationships a collectedfrom element pointing to OpenAIRE itself, indicating that the relationship (e.g., a funding reference) was provided by an OpenAIRE (mining) algorithm.

OpenAIRE is a recognized datasource within the Graph, with an official name and identifier. The elements in the collectedfrom list are of type eu.dnetlib.dhp.schema.oaf.KeyValue, requiring the key and value fields to be set. The values to use are:

key: 10|infrastruct_::f66f1bd369679b5b077dcdf006089556
value: OpenAIRE

[marekhorst]

The collectedfrom value should not be hardcoded, even in the workflow.xml definition as a default value, but it should be introduced in the config-default.template XML file stored in this repository:

https://git.icm.edu.pl/openaire/iis-deployment/-/blob/master/deploy/apps/primary/wf/primary/main/config-default/config-default.template

[marekhorst]

export_relation_collectedfrom_value is the parameter name to convey the value to be stored by exporter module in Relation#collectedfrom[].value.

It was already introduced in the default-config.template file in the configuration git repo:
https://git.icm.edu.pl/openaire/iis-deployment/-/commit/e12d3e4a23517b8e1d5601aa077c0293d8f08d40