Add explicit project type configuration for DurableTask source generator

[Copilot]

The generator auto-detects project type by checking for Microsoft.Azure.Functions.Worker.Extensions.DurableTask in referenced assemblies. This fails when transitive dependencies include Functions packages but the project targets Durable Task Worker/Scheduler, causing incorrect code generation (Functions triggers instead of AddAllGeneratedTasks).

Changes

• New MSBuild property: DurableTaskGeneratorProjectType overrides auto-detection

  • Standalone: Forces standalone Durable Task Worker mode
  • Functions: Forces Azure Functions mode
  • Auto or omitted: Uses existing auto-detection

• Implementation: Read property via AnalyzerConfigOptionsProvider in generator initialization, check explicit config before falling back to assembly detection

• Tests: 7 tests covering override scenarios and fallback behavior

Usage

<PropertyGroup>
  <!-- Force Standalone mode despite Functions dependencies -->
  <DurableTaskGeneratorProjectType>Standalone</DurableTaskGeneratorProjectType>
</PropertyGroup>

Generates AddAllGeneratedTasks() registration method:

builder.Services.AddDurableTaskWorker(b => 
{
    b.AddTasks(r => r.AddAllGeneratedTasks());
});

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Generator needs explicit project type configuration option</issue_title>
<issue_description>I am attempting to use the code as seen here:
https://github.com/microsoft/durabletask-dotnet/blob/main/samples/WebAPI/Program.cs

builder.Services.AddDurableTaskWorker(builder =>
{
    builder.AddTasks(r => r.AddAllGeneratedTasks());
});

However, because I have an indirect dependency (not used!) importing packages relating to Durable Functions the code generation does not generate the AddAllGeneratedTasks method. The generated code is targeting functions, when instead I am trying to use App Service.

Problem:
The code generator analyzes all imported packages and generates code targeting Azure Functions if a Functions related dependency is found. This is even true for unused transitive dependencies.

Request:
Provide an explicit option for setting the generator output project type (e.g. via Property in the csproj file)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Generator needs explicit project type configuration option #402

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[YunchuWang]

@copilot update Worker/DurableTaskScheduler/DurableTaskWorker: Forces Worker mode
DurableFunctions/Functions/AzureFunctions: Forces Functions mode

to two modes, functions and standalone only.

[Copilot]

@copilot update Worker/DurableTaskScheduler/DurableTaskWorker: Forces Worker mode
DurableFunctions/Functions/AzureFunctions: Forces Functions mode

...

Updated in commit cbdc3b9. The configuration now uses two modes:

• Functions: Forces generation of Azure Functions-specific code
• Standalone: Forces generation of standalone Durable Task Worker code

All tests updated and passing (45 total).