As Developer, add BCs and SDTM Specializations to the /mdr/products endpoint response

**Description**

- As Developer, I want BC and SDTM specializations products added to /mdr/products endpoint response.

**Acceptance criteria**

- The products endpoint provides links to the list of latest biomedical concepts and dataset specializations
- The products endpoint returns the following payload (cosmos links added):
{
"_links": {
"data-analysis": {}
...
"cosmos": {
"_links": {
"biomedical-concepts": {
"href": "/mdr/bc/biomedicalconcepts",
"title": "Biomedical Concepts (latest version)",
"type": "Biomedical Concept List"
},
"sdtm-dataset-specializations": {
"href": "/mdr/specializations/sdtm/datasetspecializations"
"title": "SDTM Dataset Specializations (latest version)",
"type": "SDTM Dataset Specialization List"

}
}
}