Add label synonym polysemy check

[anitacaron]

This is the same check available in Uberon.

Currently, this check has two violations as already raised in the issue

• CL:0009077 & CL:0002294 are duplicates?  #2101:

FAIL Rule ../sparql/label-synonym-polysemy-violation.sparql: 2 violation(s)
entity,property,value
http://purl.obolibrary.org/obo/CL_0002294,http://www.geneontology.org/formats/oboInOwl#hasExactSynonym,subcapsular thymic epithelial cell
http://purl.obolibrary.org/obo/CL_0009077,http://www.w3.org/2000/01/rdf-schema#label,subcapsular thymic epithelial cell

[anitacaron]

The two violations need to be fixed for this PR can be merged.

[ghost]

@anitacaron, #2101 has been resolved. Can you proceed with the linked PR or is it also dependent on #2102?

[anitacaron]

@bvarner-ebi, this doesn't depend on #2102 because it's already on the ROBOT report as WARN.

Now, after updating the branch from master, it just need to pass the checks and it can be merged.

[ghost]

Tested locally.
Expected output observed.
Thanks, @anitacaron!