Support -insecure-skip-verify flag for LSIF upload
Created by: Strum355
As we previously used a different API client as was provided in the src-cli codebase, we did not take into account the -skip-insecure-verify flag. This affected a customer as they used self-signed certs.
This PR passes the src-cli configured API client that honours the flag to the LSIF upload function that resides in sg/sg/lib. The only part of the API client that is consumed is the direct pass-through method, Do(...)
Related to https://github.com/sourcegraph/sourcegraph/pull/22399 and will require bumping go.mod here when it is merged.
cc @efritz for