[DO NOT MERGE] Preview Generator Version 1.0.0-alpha.20260625.1 (Azure data plane)

[azure-sdk-automation]

This PR updates the UnbrandedGeneratorVersion property in eng/centralpackagemanagement/Directory.Generation.Packages.props and the @typespec/http-client-csharp dependency in eng/packages/http-client-csharp/package.json to version 1.0.0-alpha.20260625.1.

Details

• TypeSpec commit that triggered this PR: microsoft/typespec@94111c9
• Pipeline run that produced this PR: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=6481113&view=results

Changes

• Updated eng/centralpackagemanagement/Directory.Generation.Packages.props UnbrandedGeneratorVersion property
• Updated eng/packages/http-client-csharp/package.json dependency version
• Ran npm install to update package-lock.json
• Ran eng/packages/http-client-csharp/eng/scripts/Generate.ps1 to regenerate test projects
• Generated emitter-package.json artifacts using tsp-client
• Regenerated SDK libraries using the unbranded emitter via dotnet msbuild /t:GenerateCode

Additional changes (Azure data plane regeneration)

• Built and packaged Azure emitter locally from eng/packages/http-client-csharp
• Updated Azure emitter package artifacts in eng/
• Regenerated Azure data plane SDK libraries via dotnet msbuild /t:GenerateCode

This is an automated PR created by the TypeSpec publish pipeline.

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