syntax-highlighter: Update scip and add syntect->scip conversion
Created by: tjdevries
Nothing should be changed for the frontend in this PR. This is a purely additive PR for updates to syntax highlighter and adding a new /scip
endpoint to syntax-highlighter
cc @olafurpg @fkling
Originally: https://github.com/sourcegraph/sourcegraph/pull/39264
Test plan
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Can run syntax highlighter and normal workflows and get exactly same results as before