This PR adds the Microsoft.Extensions.Logging.Abstractions 9.0.8 reference package to support .NET source builds that require this version.

Changes Made

Added the following reference packages using the generate.sh script:

Primary Package

• Microsoft.Extensions.Logging.Abstractions 9.0.8
  • Target frameworks: net8.0, net9.0, netstandard2.0
  • Includes all required logging abstractions APIs
  • Proper dependency configuration per target framework

Dependencies (automatically generated)

• Microsoft.Extensions.DependencyInjection.Abstractions 9.0.8
• System.Diagnostics.DiagnosticSource 9.0.8
• Microsoft.Bcl.AsyncInterfaces 9.0.8

Package Structure

The generated package follows the established pattern for 9.0.x reference packages:

src/referencePackages/src/microsoft.extensions.logging.abstractions/9.0.8/
├── Microsoft.Extensions.Logging.Abstractions.9.0.8.csproj
├── lib/
│   ├── net8.0/Microsoft.Extensions.Logging.Abstractions.cs
│   ├── net9.0/Microsoft.Extensions.Logging.Abstractions.cs
│   └── netstandard2.0/Microsoft.Extensions.Logging.Abstractions.cs
└── microsoft.extensions.logging.abstractions.nuspec

Bug Fix Applied

Fixed a compilation error in System.Diagnostics.DiagnosticSource 9.0.8 for netstandard2.0 by adding Customizations.props that includes:

• IsExternalInit.cs - Required for C# init-only properties in netstandard2.0
• RequiredModifierAttributes.cs - Supporting attributes

Verification

• ✅ All target frameworks compile successfully
• ✅ Assembly version information is correct (9.0.8)
• ✅ Package structure matches existing 9.0.x packages
• ✅ Dependencies are properly configured per target framework
• ✅ Generated reference assemblies follow expected patterns
• ✅ IsExternalInit error resolved for netstandard2.0 builds

This package enables source builds that depend on Microsoft.Extensions.Logging.Abstractions 9.0.8 without requiring prebuilt binaries.

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