fix(lib/vscode): remove native-keymap and keytar (#2961)

native-keymap and keytar are only used in the electron process,
so we don't need them. This allows us to drop our dependencies on
libx11-dev, libxkbfile-dev, and libsecret-dev.

ci/images/debian10/Dockerfile

@@ -15,10 +15,7 @@ RUN curl -fsSL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
     apt-get update && apt-get install -y yarn
 
 # Installs VS Code build deps.
-RUN apt-get install -y build-essential \
-                   libsecret-1-dev \
-                   libx11-dev \
-                   libxkbfile-dev
+RUN apt-get install -y build-essential
 
 # Installs envsubst.
 RUN apt-get install -y gettext-base