Fix similarity score bug in lance/chroma dbs

[shatfield4]

Pull Request Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 🔨 chore
• 📝 docs

Relevant Issues

resolves #2937

What is in this change?

• Fix a bug where if there is an exact match in Lance or ChromaDB from the vector search (distance = 0) then similarity would be 0 and no result would be found
• Fixed by checking if distance <= 0 -> returns 1 as similarity score which means it was a perfect match
• It was previously distance <= 0 -> returns 0 for similarity
• Also fixed if (distance >= 1.0) return 0; because if distance should always be a value between 0 and 1 and if distance is greater than 1 then similarity should be 0

Additional Information

Developer Validations

• I ran yarn lint from the root of the repo & committed changes
• Relevant documentation has been updated
• I have tested my code functionality
• Docker build succeeds locally