Duplicate code to install ncr

[jaromil]

The ncr installation is already handled by the makefile of tf-pqcrypto-scripts whose repo is cloned right after this line: https://github.com/ForkbombEu/tf-pqcrypto-scripts/blob/main/Makefile

It is best to avoid duplication and use the Makefile of tf-pqcrypt-scripts also in the .tf so that whenever we'll need to fix it we have just one place to edit.

[g7240]

At the moment the tf-pqcrypto-scripts repository is only used to get contracts. ncr is managed via the setup script user-data.sh because in EC2 it is necessary to make the ncr startup persistent when the system reboot; now we are doing it via systemctl.