Use JSON-LD media type for OAI-ORE exports

[lntutor]

Summary

• return application/ld+json for OAI-ORE dataset exports
• update the export-formats API fixture
• add regression coverage and an API-user release note

Test plan

• mvn -Dtest=OAI_OREExporterTest test
• mvn -Dcheckstyle.includes=src/main/java/edu/harvard/iq/dataverse/export/OAI_OREExporter.java,src/test/java/edu/harvard/iq/dataverse/export/OAI_OREExporterTest.java checkstyle:check
• jq empty src/test/resources/json/export-formats.json
• git diff --check

Closes #11580

[lntutor]

Current head 8e86c712b15af94a172cd75714a3138c53e14172 is mergeable, the Read the Docs preview is green, and there are no unresolved review threads on the current PR state. This looks ready for maintainer review when convenient.

[pdurbin]

@lntutor thanks for the pull request! I just clicked this "Approve workflows to run" button:

[pdurbin]

We should check that the API endpoint for downloading export formats supports JSON-LD, as discussed at tech hours.

[qqmyers]

Verified that the export api allows json-ld:

dataverse/src/main/java/edu/harvard/iq/dataverse/api/Datasets.java

Line 251 in 19c5a10

@Produces({"application/xml", "application/json", "application/html", "application/ld+json", "*/*" })

[qqmyers]

Looks fine - thanks for the PR.