chore: remove now unneeded global nyc installation

.devcontainer/postCreateCommand.sh

@@ -18,7 +18,6 @@ composer global require google/cloud-storage
 # for JS testing
 JAVASCRIPT_DIRECTORY="$(pwd)/js"
 npm --prefix "$JAVASCRIPT_DIRECTORY" install "$JAVASCRIPT_DIRECTORY"
-npm install --global nyc
 
 # development webserver
 sudo chmod a+x "$(pwd)" && sudo rm -rf /var/www/html && sudo ln -s "$(pwd)" /var/www/html