Build is now failing in the Update PR

[JoshLove-msft]

#9082 updated to use sparse checkout but we are missing the Azure.Core shared source files:

CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/TrimmingAttribute.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/example/basic/src/Specs.Azure.Example.Basic.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/RawRequestUriBuilder.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/TypeFormatters.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/RequestHeaderExtensions.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/AppContextSwitchHelper.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/ClientDiagnostics.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/DiagnosticScopeFactory.cs' could not be found. [/tmp/azure-sdk-for-net-20251125-171710/eng/packages/http-client-csharp/generator/TestProjects/Spector/http/azure/client-generator-core/api-version/header/src/Specs.Azure.ClientGenerator.Core.ApiVersion.Header.csproj::TargetFramework=net8.0]
CSC : error CS2001: Source file '/tmp/azure-sdk-for-net-20251125-171710/eng//../sdk/core/Azure.Core/src/Shared/DiagnosticScope.cs' could not be found. [/tmp/azure-