Add OAI-PMH Ingestors

[eilmiv]

Summary of changes

• Add ingestor for OAI-PMH endpoints that ingests materials and events based on Dublin Core metadata
• Add ingestor for OAI-PMH endpoints that ingests materials and events based on Bioschemas RDF metadata

Motivation and context

This is a relevant step in the mTeSS-X project. In particular, it is MR11. See #1179.

Checklist

• I have read and followed the CONTRIBUTING guide.
• I confirm that I have the authority necessary to make this contribution on behalf of its copyright owner and agree
  to license it to the TeSS codebase under the
  BSD license.

[Copilot]

Pull request overview

Adds a new OAI-PMH ingestion pathway to TeSS to import Events and Materials from remote OAI-PMH endpoints, with support for both Dublin Core and Bioschemas RDF metadata (MR11 / #1179).

Changes:

• Introduce Ingestors::OaiPmhIngestor with RDF-first (Bioschemas) parsing and Dublin Core fallback.
• Register the new ingestor in IngestorFactory.
• Add unit tests covering empty endpoints, Dublin Core materials/events, mixed records, and Bioschemas RDF parsing.
• Fix HTML body tag class attribute quoting in the application layout.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
lib/ingestors/oai_pmh_ingestor.rb	New OAI-PMH ingestor implementation for RDF (Bioschemas) and Dublin Core ingestion.
lib/ingestors/ingestor_factory.rb	Registers Ingestors::OaiPmhIngestor as an available ingestor.
test/unit/ingestors/oai_pmh_test.rb	Adds unit tests for OAI-PMH ingestion behavior and parsing outcomes.
app/views/layouts/application.html.erb	Quotes body class attribute to produce valid HTML when multiple classes are emitted.

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