Remove usage of lsif-semanticdb (the original Go cli)

.devcontainer/Dockerfile

@@ -6,7 +6,6 @@ FROM mcr.microsoft.com/vscode/devcontainers/base:0-${VARIANT}
 
 # [Optional] Uncomment this section to install additional OS packages.
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-    && apt-get -y install --no-install-recommends default-jdk gradle maven golang-go \
-    && go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb
+    && apt-get -y install --no-install-recommends default-jdk gradle maven
 
 

.github/workflows/ci.yml

@@ -13,7 +13,6 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: "^1.13.1"
-      - run: go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb
       - run: sbt test
   check:
     runs-on: ubuntu-latest

docs/contributing.md

@@ -11,8 +11,6 @@ This page documents tips and tricks for contributing to the
 
 - `java`: any version should work
 - `git`: any version should work
-- `lsif-semanticdb`:
-  `go get github.com/sourcegraph/lsif-semanticdb/cmd/lsif-semanticdb`
 - `gradle`: `brew install gradle`, or see
   [general installation guide](https://gradle.org/install/).
 - `mvn`: `brew install maven`, or see