[REQUEST]: LLM Matrix add Sonnet 3.7

[dhru42]

Description

What: we need to add a new model Sonnet 3.7 to the LLM matrix, with its rating as Excellent across the board.

Resources

N/A

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

n/a

What release is this request related to?

N/A

Collaboration model

The documentation team

Point of contact.

Main contact: @dhru42 @jamesspi

Stakeholders: