Custom HelpProvider is being overridden by the default HelpProvider

[kedde]

Information

• OS: [eg Windows]
• Version: git(main)
• Terminal: [e.g Windows Terminal]

Describe the bug

Can not register a Custom HelpProvider when using Microsoft.Extensions.DependencyInjection & Spectre.Console.Cli.Extensions.DependencyInjection. The default HelpProvider is used in stead of
the custom help provider.

My guess is, that the following line is overriding the HelpProvider.

spectre.console/src/Spectre.Console.Cli/Internal/CommandExecutor.cs

Line 27 in 131b37f

_registrar.RegisterInstance(typeof(IHelpProvider), defaultHelpProvider);

To Reproduce
Steps to reproduce the behavior.

I installed these two nuget packages:

• Microsoft.Extensions.DependencyInjection
• Spectre.Console.Cli.Extensions.DependencyInjection

and modified the test Should_Output_Custom_Help_When_Registered_By_Instance to use

[Fact]
[Expectation("Custom_Help_Registered_By_Instance")]
public Task Should_Output_Custom_Help_When_Registered_By_Instance()
{
    var services = new ServiceCollection();
    var registrar = new DependencyInjectionRegistrar(services);

    // Given
    var fixture = new CommandAppTester(registrar);
    fixture.Configure(configurator =>
    {
        // Create the custom help provider
        var helpProvider = new CustomHelpProvider(configurator.Settings, "1.0");

        // Register the custom help provider instance
        registrar.RegisterInstance(typeof(IHelpProvider), helpProvider);

        configurator.SetApplicationName("myapp");
        configurator.AddCommand<DogCommand>("dog");
    });

    // When
    var result = fixture.Run();

    // Then
    return Verifier.Verify(result.Output);
}

Expected behavior

Custom HelpProvider should be used.

Screenshots
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Additional context
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[nils-a]

Closing as duplicate of #1313