Use specific internal labels for the app

[msenechal]

We saw that for few documents, depending of the content (and schema) the LLM might come back with a KG that would create entities or relationships with labels or types that we use internally.
This is an issue for graph viz (and other processes) since we expect to get specific nodes/relationships (i.e Document PART_OF Chunk) but Document and PART_OF can be used between entities

Solution:

Every internal labels and relationships should be renamed __XXX__ 
Nodes: __Document__ , __Chunk__ , __Message__ , __Session__
Relationships: __PART_OF__ , __FIRST_CHUNK__ , __NEXT_CHUNK__ , __SIMILAR__ , __NEXT__ , __LAST_MESSAGE__

Also, in the GraphEnhancement modal to provide a schema, we should filter out those internal labels