Remove temporary package additions (losh-*)

losh-backend/Dockerfile

@@ -17,8 +17,6 @@ RUN set -x \
     && git clone -b "$VERSION" --depth 1 "$REPOSITORY_URL" /tmp/losh-backend-src \
     && cd /tmp/losh-backend-src \
     && yarn server install --production \
-    # production installation lacks the typescript package, which is required for building the project
-    && yarn server add typescript@^4.4.4 \
     && ELASTIC_API_URL="$ELASTIC_API_URL" WIKIBASE_API_URL="$WIKIBASE_API_URL" yarn server build \
     && cp -a ./packages/server/dist /tmp/losh-backend \
     && cp ./packages/server/package.json ./packages/server/yarn.lock /tmp/losh-backend \

losh-frontend/Dockerfile

@@ -23,8 +23,6 @@ RUN set -x \
     && git clone -b "$VERSION" --depth 1 "$REPOSITORY_URL" /tmp/losh-frontend-src \
     && cd /tmp/losh-frontend-src \
     && yarn client install --production \
-    # production installation lacks the gatsby-plugin-eslint package, which is required for building the project
-    && yarn client add gatsby-plugin-eslint@^3.0.0 \
     # disable telemetry for this automated build
     && yarn run gatsby telemetry --disable \
     && PATH_PREFIX="$PATH_PREFIX" GRAPHQL_API_URL="$GRAPHQL_API_URL" yarn client run gatsby build --prefix-paths \