chore: move Code to a submodule (#4990)

* Move Code to a submodule

Closes #4901.

* Base Code cache on hash and re-enable node_modules cache

The current setup appears to only rebuild VS Code if the dependencies
change but we need to rebuild it if anything changes.

I also re-enabled the commented out node_modules caches.  They look like
they should work to me with the submodule method.  I think the problem
occurred because Code itself was being installed in the yarn step.

ci/build/build-release.sh

@@ -15,8 +15,8 @@ main() {
 
   source ./ci/lib.sh
 
-  VSCODE_SRC_PATH="vendor/modules/code-oss-dev"
-  VSCODE_OUT_PATH="$RELEASE_PATH/vendor/modules/code-oss-dev"
+  VSCODE_SRC_PATH="lib/vscode"
+  VSCODE_OUT_PATH="$RELEASE_PATH/lib/vscode"
 
   mkdir -p "$RELEASE_PATH"
 
@@ -25,7 +25,7 @@ main() {
 
   rsync ./docs/README.md "$RELEASE_PATH"
   rsync LICENSE.txt "$RELEASE_PATH"
-  rsync ./vendor/modules/code-oss-dev/ThirdPartyNotices.txt "$RELEASE_PATH"
+  rsync ./lib/vscode/ThirdPartyNotices.txt "$RELEASE_PATH"
 }
 
 bundle_code_server() {

ci/build/build-standalone-release.sh

@@ -33,8 +33,7 @@ main() {
   # HACK: the version of Typescript vscode 1.57 uses in extensions/
   # leaves a few stray symlinks. Clean them up so nfpm does not fail.
   # Remove this line when its no longer needed.
-
-  rm -fr "$RELEASE_PATH/vendor/modules/code-oss-dev/extensions/node_modules/.bin"
+  rm -fr "$RELEASE_PATH/lib/vscode/extensions/node_modules/.bin"
 }
 
 main "$@"

ci/build/build-vscode.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# Builds vscode into vendor/modules/code-oss-dev/out-vscode.
+# Builds vscode into lib/vscode/out-vscode.
 
 # MINIFY controls whether a minified version of vscode is built.
 MINIFY=${MINIFY-true}
@@ -9,7 +9,7 @@ MINIFY=${MINIFY-true}
 main() {
   cd "$(dirname "${0}")/../.."
 
-  cd vendor/modules/code-oss-dev
+  cd lib/vscode
 
   # Any platform works since we have our own packaging step (for now).
   yarn gulp "vscode-reh-web-linux-x64${MINIFY:+-min}"

ci/build/npm-postinstall.sh

@@ -90,8 +90,8 @@ symlink_asar() {
 }
 
 vscode_yarn() {
-  echo 'Installing vendor dependencies...'
-  cd vendor/modules/code-oss-dev
+  echo 'Installing Code dependencies...'
+  cd lib/vscode
   yarn --production --frozen-lockfile
 
   symlink_asar