update use of argument parser to latest API

[tomerd]

motivation: Address warnings

changes: use newer API for retrieving unparsed arguments

[tomerd]

@swift-ci smoke test

[tomerd]

@natecook1000 this is an attempt to update the new allUnrecognized API but testCommandPluginArgumentsNotSwallowed which worked previously is failing with this, basically seems like the --help and --version arguments get swallowed again. any advise?

[natecook1000]

All of these except for the command you use for re-parsing the input should be .captureForPassthrough to maintain the same behavior, as that's the new name for .unconditionalRemaining. The new .allUnrecognized parsing strategy doesn't capture help flags, since those belong to the original command.

[natecook1000]

🤔 Although, thinking of it now, using .allUnrecognized to re-parse will probably ditch when it sees the help flags. You'll want to add this to the PluginArguments type so that it doesn't try to parse any help flags:

struct PluginArguments: ParsableCommand {
    static var configuration: CommandConfiguration {
        .init(helpNames: [])
    }
    // etc...
}

[tomerd]

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