Add MassTransit Filter Registration Support with IBusRegistrationContext

[Copilot]

This PR adds an extension package Elsa.MassTransit.Extensions that enables MassTransit scoped filter registration with IBusRegistrationContext in Elsa Workflows.

Problem Solved

The standard Elsa MassTransit integration packages (Elsa.ServiceBus.MassTransit.*) don't provide direct access to the IBusRegistrationContext in configuration callbacks, which makes it impossible to register scoped middleware/filters as documented in the MassTransit documentation.

Solution Approach

Instead of modifying the existing NuGet packages, I created a new extension package that wraps the original functionality while adding the missing capability:

1. RabbitMqBusExtensions.cs

   • Adds UseRabbitMqWithContext extension method
   • Provides ConfigureUsingContext method that accepts a delegate with IBusRegistrationContext

2. AzureServiceBusExtensions.cs

   • Adds UseAzureServiceBusWithContext extension method
   • Provides ConfigureUsingContext method that accepts a delegate with IBusRegistrationContext

3. README.md with usage examples

Usage Example

elsa.UseMassTransit(massTransit =>
{
    // Use the extension method instead of the standard UseRabbitMq
    massTransit.UseRabbitMqWithContext(rabbitMqConnectionString, rabbit => 
    {
        // Standard configuration still works
        rabbit.ConfigureTransportBus = (context, bus) =>
        {
            bus.PrefetchCount = 50;
            bus.Durable = true;
        };
        
        // New capability: Configure using context
        rabbit.ConfigureUsingContext((configurator, context) =>
        {
            // Now you can register scoped filters
            configurator.UseConsumeFilter(typeof(YourScopedFilter<>), context);
            
            // Or access other capabilities that require IBusRegistrationContext
            configurator.ConfigureEndpoints(context);
        });
    });
});

Benefits

1. Backward Compatible: No changes to existing code required
2. Clear API: New method names clearly indicate the enhanced functionality
3. Minimal Changes: Focused solution that addresses only the specific issue
4. Documentation: Included usage examples for easy adoption

Fixes #6552.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• f.feedz.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)
  • Triggering command: dotnet build src/extensions/Elsa.MassTransit.Extensions/Elsa.MassTransit.Extensions.csproj (dns block)
  • Triggering command: dotnet restore src/extensions/Elsa.MassTransit.Extensions/Elsa.MassTransit.Extensions.csproj (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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