fix: remove Claude Sonnet 3.5

Manoj M Jrequested to merge
mmj-remove-sonnet-3-5 into main

What does this merge request do and why?

For Remove Claude Sonnet 3.5 due to Anthropic depre... (gitlab-org/gitlab#572012)

Since Claude is removing support for Sonnet 3.5 on Oct 22, 2025, we need to remove it from the list of supported models.

https://docs.claude.com/en/docs/about-claude/model-deprecations#model-status

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

  • Tests added for new functionality. If not, please raise an issue to follow up.
  • Documentation added/updated, if needed.
  • If this change requires executor implementation: verified that issues/MRs exist for both Go executor and Node executor or confirmed that changes are backward-compatible and don't break existing executor functionality.

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