fix(cli) CLI integ tests cannot be executed locally (aws#6482)

symlink monorepo packages instead of using npm install
Fixes aws#6477

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

packages/aws-cdk/test/integ/run-wrappers/repo/npm

@@ -11,15 +11,23 @@ if [[ "$command" == "install" || "$command" == "i" ]]; then
 
   while [[ "${1:-}" != "" ]]; do
     packageloc=$(cd $REPO_ROOT && npx lerna ls --loglevel silent -p --scope $1) && {
-      # Rewrite to 'npm install /path/to/@aws-cdk/pkg'
-      npmargs="$npmargs $packageloc"
+      # Symlink that location into node_modules
+      dir=$(dirname node_modules/$1)
+      mkdir -p $dir
+      echo "$dir/$1 -> $packageloc" >&2
+      ln -s $packageloc $dir/
     } || {
       npmargs="$npmargs $1"
     }
     shift
   done
 
+  if [[ "$npmargs" == "install" ]]; then
+    # No rewrites
+    exit 0
+  fi
+
   exec $ORIGINAL_NPM $npmargs
 fi
 
-exec $ORIGINAL_NPM "$@"
+exec $ORIGINAL_NPM "$@"