Update RegenPreview Local Script to Allow Specified Library to Regen

[jorgerangel-msft]

In https://github.com/microsoft/typespec/blob/main/packages/http-client-csharp/eng/scripts/RegenPreview.ps1, it would aid the dev workflow if we the script also allowed a "Libraries" param that when provided, the script would only regenerate the specified libraries. In example RegenPreview.ps1 -Libraries "Azure.ResourceManager.AppContainers, Azure.Data.AppConfig"

[github-actions]

🎯 Issue Triage

Feature request to enhance RegenPreview.ps1 to accept a -Libraries parameter, allowing developers to regenerate only specified libraries instead of all of them.

Category: Feature Request

Area: emitter:client:csharp

🔍 Analysis

• File affected: packages/http-client-csharp/eng/scripts/RegenPreview.ps1
• The script currently regenerates all preview libraries; adding a -Libraries parameter would improve developer ergonomics by enabling targeted regen (e.g., -Libraries "Azure.ResourceManager.AppContainers, Azure.Data.AppConfig")
• Note: Fix library computation in RegenPreview script #9067 (closed) addressed a Libraries parameter null-binding bug in the script — this new issue requests the feature itself to be added.

📝 Suggested next steps

• Add -Libraries parameter to RegenPreview.ps1 that accepts a comma-separated list of library names
• Filter the library list before regeneration when the parameter is provided
• Update script documentation/help text

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