refactor: error messaging

[AlexD10S]

As pointed out by @brunopgalvao in his review #306 (review), some error messages are displayed awkwardly to the user.
For example:

┌   Pop CLI : Call a contract
│
◇  Where is your project located?
│  ./
│
◇  Paste the on-chain contract address:
│  5DYs7UGBm2LuX4ryvyqfksozNAW5V47tPbGiVgnjYWCZ29bt
│
└  Unable to fetch contract metadata.
Error: Anyhow error: Cannot infer the root project id

Let's review all commands and ensure the error messages are displayed in a clear and user-friendly manner, customizing them where necessary.