nightly-2024-05-29: chore: remove duplicated code from LSP (#5116)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

We've got some copy pasted code here so I've added a helper function for
converting a "position" to a "location".

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

---------

Co-authored-by: jfecher <jake@aztecprotocol.com>