Added back "service.legal.admin" service group in Ent v2 JSON file

Related Issue

As per this MR - We removed the service group "service.legal.admin" from the OSDU but we later found, we need this group as it is been used by the Legal and Storage Integration tests. Hence, adding it back.

approved this merge request

approved this merge request

mentioned in commit a237b85f

merged

added Azure GC labels

changed milestone to %M5 - Release 0.8