EU: add foreignSubsidyMeasureConclusion string field to bids.details

[odscjen]

see open-contracting/european-union-support#219 for discussion about need for this field.

@jpmckinney do you think it is worth making this a codelist with the Foreign Subsidy Measure Conclusion codes (similar to what we've done for SelectionCriteria.sources in open-contracting-extensions/ocds_eu_extension#18 or just leave it as free-text?

[jpmckinney]

Might as well use the codelist, to match the expected mapping.

[jpmckinney]

I am debating whether to name it "foreignSubsidyMeasures" since field is defined as "Measures applied under the Foreign Subsidies Regulation (EU) 2022/2560." and the codelists's Dataset details has "This code list is about the situation of Measures applied under the Foreign Subsidies Regulation (EU) 2022/2560. "