Yarn 4 Migration (#32253)

Migrates the Overleaf monorepo package manager from npm (v11) to Yarn 4 (v4.9.1) using node-modules linker mode.

GitOrigin-RevId: 50d32ab01955c15e29679eff9e9e9cfb897fab2d

server-ce/Dockerfile-base

@@ -33,6 +33,7 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 &&  echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_22.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list \
 &&  apt-get update \
 &&  apt-get install -y nodejs \
+&&  corepack enable \
     \
 &&  rm -rf \
 # We are adding a custom nginx config in the main Dockerfile.