Export Metadata Use Case

[ChengShi-1]

What this PR does / why we need it:

Export Metadata Use Case

Which issue(s) this PR closes:

• Closes Export Metadata Use Case #462

Related Dataverse PRs:

• Depends on #

Special notes for your reviewer:

UnlinkCollection test error, the subcollection was removed from the collection links API response, but it still appeared in the Solr-backed /search?subtree=... response, which led an error when of getCollectionItem use case. I fixed by using getCollectionLinks use case to check if the unlinking works successfully

Suggestions on how to test this:

Is there a release notes or changelog update needed for this change?:

YES

Additional documentation:

[Copilot]

Pull request overview

Adds a new datasets use case for exporting dataset metadata via Dataverse GET /datasets/export (including draft support), exposing it through the public datasets API and documenting it. Also updates unlink-collection tests to validate unlinking through the links API rather than Solr-backed search results.

Changes:

• Introduce exportDatasetMetadata use case + repository method, and export ExportedDatasetMetadata type.
• Add unit + integration coverage for metadata export (latest published default + draft export).
• Stabilize unlink-collection tests by asserting via getCollectionLinks instead of /search?subtree=....

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/unit/datasets/ExportDatasetMetadata.test.ts	Adds unit tests for the new ExportDatasetMetadata use case behavior.
test/integration/datasets/DatasetsRepository.test.ts	Adds integration coverage for exporting latest published and draft dataset metadata.
test/integration/collections/CollectionsRepository.test.ts	Updates unlink test to validate via collection links API instead of Solr search.
test/functional/collections/UnlinkCollection.test.ts	Updates functional unlink test to verify via getCollectionLinks.
src/datasets/infra/repositories/DatasetsRepository.ts	Implements exportDatasetMetadata API call and response shaping.
src/datasets/index.ts	Wires/export the new use case and exports the response type.
src/datasets/domain/useCases/ExportDatasetMetadata.ts	Adds the new domain use case wrapper.
src/datasets/domain/repositories/IDatasetsRepository.ts	Extends repository interface with exportDatasetMetadata.
src/datasets/domain/models/ExportedDatasetMetadata.ts	Introduces the response type for exported metadata.
docs/useCases.md	Documents the new use case and updates the datasets read use-cases list.
CHANGELOG.md	Adds a changelog entry for the new dataset metadata export feature.

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