fix(cli): use AsyncParsableCommand for plugin run and test commands

Summary

• Fix tuist plugin run and tuist plugin test which silently print help instead of executing the plugin
• Change PluginRunCommand and PluginTestCommand from ParsableCommand to AsyncParsableCommand so their async func run() is actually dispatched

Resolves https://github.com/tuist/tuist/issues/10602

Test plan

• Build the CLI: tuist generate tuist --no-open && xcodebuild build -workspace Tuist.xcworkspace -scheme tuist CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO CODE_SIGN_IDENTITY=""
• Create a minimal plugin package and run tuist plugin run --path <path> <target> — should execute the plugin instead of printing help
• Run tuist plugin test --path <path> on a plugin with tests — should run tests instead of printing help
• Verify tuist plugin build and tuist plugin archive are unaffected (they already had correct conformance)

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