Use stellar scaffold cli upgrade command in setup script

[CoveMB]

Stellar

Summary

Use stellar scaffold cli upgrade command in setup script that is zip in the downloadable for stellar scaffold project

Description

The current setup script that is zip under the downloadable Scaffold project and used to set the project as such, uses the init command and then manipulates various file like environment and Cargo files to fit the current contract. The changes proposed here instead uses the newly added upgrade command of the stellar-scaffold upgrade to automatically upgrade from a working Rust environment.