Reconcile the assay ontology vocabulary with existing vocabularies.

[jstone-dev]

• Review all controlled vocabulary terms in the assay ontology.
• Wherever possible, add codes from an appropriate vocabulary, and update labels to match the vocabulary.
• Add any new vocabulary terms deemed necessary.

Version 2 of the AVE-DCD minimum information standard for MAVEs should be used as a guide to vocabulary selection. In addition, the IGVF Coding Variants pillar project data curation team's workbook already uses standard vocabularies for some terms.

In particular, Gene Ontology values or similar should be used for the "phenotypic assay mechanism" attribute. A validator that requires GO codes for this attribute should then be un-commented (in lib/validation/keywords.py), together with its unit tests (in tests/validation/test_keywords.py and tests/routers/test_experiments.py).

[EstelleDa]

Based on the new keywords list, Phenotypic Assay Mechanism saves the SO terms, and Molecular Mechanism Assessed has the combinations of GO terms. The current solution is that an experiment is allowed to have multiple Molecular Mechanism Assessed labels.