Set license expression on nuget

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Is your feature request related to a problem? Please describe the problem.

By using a license url external tools can not easily analyse the license types in use

### Describe the solution you'd like

The nuget package has the license expression set

### Additional context

N/a

Inspect the NuGet package metadata and locate where the current external license URL is defined. Replace or supplement that metadata with the requested license expression, then build the package and verify that its generated metadata exposes the expression for external analysis.

Written by the indexing model from the issue text.