Fix NuGet package push on Windows

[dsyme]

Summary

• expand temp/*.nupkg with PowerShell before invoking dotnet nuget push
• push each concrete package path and propagate native command failures
• update the existing 11.0.0-alpha001 section so merging this PR retries the failed release

Cause

PowerShell passed the quoted temp/*.nupkg argument literally. dotnet nuget push does not expand that wildcard and failed with File does not exist (temp/*.nupkg).

Release state

All four expected 11.0.0-alpha001 flat-container URLs currently return HTTP 404, so no package was partially published. --skip-duplicate remains in place to keep any subsequent partial retry safe.

Merging this PR is expected to rerun the release workflow for 11.0.0-alpha001 because its versioned release-note section changes.

Validation

• actionlint .github/workflows/release.yml
• git diff --check
• release detector simulation confirms the 11.0.0-alpha001 section changed relative to origin/master