[playground] Add uploadStandalonePackageAssets and extract uploadAssets helper to bundle-uploader

[JennyPng]

• extract the binary asset wheel uploading logic (for the pygen wheel) so that it can be used externally by the typespec-azure repo's upload pipeline
• needed to enable Python emitter in Azure playground, so that a pygen wheel can be uploaded at a discoverable index by the typespec-python emitter
• for full context, see description of Add python emitter to azure playground Azure/typespec-azure#4486

[github-actions]

No changes needing a change description found.

[azure-sdk-automation]

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

[Copilot]

Pull request overview

This PR updates the @typespec/bundle-uploader internal helper library to support uploading standalone binary assets (notably the Python pygen wheel) to blob storage, enabling the Azure playground to discover those assets via an index.

Changes:

• Extracted asset globbing/upload logic into a shared uploadAssets helper.
• Refactored uploadPlaygroundAssets to reuse the new helper.
• Added a new exported API uploadStandalonePackageAssets to upload only binary assets without bundling.

[microsoft-github-policy-service]

Hi @@JennyPng. Your PR has had no update for 14 days and it is marked as a stale PR. If it is not updated within 14 additional days, the PR will automatically be closed. If you want to refresh the PR, please remove the stale label.

[microsoft-github-policy-service]

Hi @@JennyPng. Your PR has had no update for 14 days and it is marked as a stale PR. If it is not updated within 14 additional days, the PR will automatically be closed. If you want to refresh the PR, please remove the stale label.