push version and info command activation into the Option definitions

[baronfel]

Small cleanup of the WorkloadCommandParser to reduce the amount of custom code we need to write.

[Copilot]

Pull Request Overview

This PR refactors the WorkloadCommandParser by moving the logic that handles --info and --version into the option definitions themselves, eliminating the custom ProcessArgs method.

• Assigns Action handlers directly on InfoOption and VersionOption
• Removes bespoke argument-processing in ProcessArgs in favor of built-in handling
• Introduces ShowWorkloadsInfoAction and ShowWorkloadsVersionOption as nested action classes

Comments suppressed due to low confidence (1)

src/Cli/dotnet/Commands/Workload/WorkloadCommandParser.cs:189

• [nitpick] The class ShowWorkloadsVersionOption implements an action, so its name ending in 'Option' may be misleading. Consider renaming it to ShowWorkloadsVersionAction for clarity.

    private class ShowWorkloadsVersionOption : SynchronousCommandLineAction

[Copilot]

New action classes were introduced (ShowWorkloadsInfoAction and ShowWorkloadsVersionOption) without corresponding tests. Since this is significant behavior change, please add unit tests to cover these handlers.