Create a Formalized SHACL Test Suite

[ashepherd]

This issue is to start converging on a set of test SHACL shapes for the SOSO guidelines as mentioned as a useful activity for the ESIP Cluster at the 2025 Winter Meeting.

Calling for existing work to be posted here, and to begin creating a test suite. I'll put on the ESIP Cluster Agenda for Thursday, March 27th at 2:30pmET

From the ESIP Winter Meeting
https://docs.google.com/document/d/1_rLqkC7uvTSiQfjWv1FTNVsDvQOkolHfgtNYyJnJXrM/edit?tab=t.0#bookmark=id.f4o1j9ijkibq

@adplincinst @fils @datadavev