LSIF: Remove legacy query endpoints and frontend proxy
Created by: efritz
https://github.com/sourcegraph/sourcegraph-basic-code-intel/pull/178 uses the GraphQL API for LSIF-based code intel rather than the 'legacy' HTTP API. This removes the old API, simplifies docs, and simplifies some test assertions.
TODO (Edit: TO-DONE)
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Bump and publish a new version of basic-code-intel -
Bump the versions in sourcegraph-{go,typescript}