Flag to skip user confirmation

[AlexD10S]

Add a flag to all pop-cli commands that expect user confirmation, allowing users to bypass the confirmation prompt. This will enable smoother automation and faster command execution.

Example from cargo-contracts repository:

/// Before submitting a transaction, do not ask the user for confirmation.
    #[clap(short('y'), long)]
    skip_confirm: bool,

Suggested in this comment: #206 (comment)