Commands which expect a single argument don't error when multiple are provided

[aryanjassal]

Specification

There are commands which only accept a single positional argument, like secrets write. If multiple arguments are provided to the command, only the first argument is actually processed, and others are silently ignored.

This behaviour shouldn't happen, and if there are more positional arguments than expected, the command should fail and print the help menu.

Additional context

• Similar issue discovered in Polykey-CLI#317

Tasks

1. Error if multiple arguments are provided to a command which only accepts one
2. Add tests to ensure this behaviour

[linear]

ENG-474 Commands which expect a single argument don't error when multiple are provided