Fix creation of nuget symbol file

What does this MR do and why?

Fix creation of nuget symbol file

In !170692 (merged) we've added the changes to Packages::Nuget::Symbol to work with both Packages::Package and Packages::Nuget::Package that caused the issue in Packages::Nuget::Symbols::CreateSymbolFilesService that was only working correctly with the Packages::Nuget::Package class.

References

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• !170692 (merged)

MR acceptance checklist

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Screenshots or screen recordings

No.

How to set up and validate locally

When the feature flag is disabled

1. Disable the feature flag: Feature.disable(:nuget_extract_nuget_package_model)

2. Make sure you have the NuGet CLI installed (see nuget docs for links to installation pages).

3. Add a project as your NuGet source in your local GitLab NuGet Repository:

   nuget source Add -Name localhost -Source "http://gdk.test:3000/api/v4/projects/<project_id>/packages/nuget/index.json" -UserName <gitlab_username> -Password <personal_access_token>

4. Push a NuGet package that has a symbol to your project. You can test using this one. Download both the .nupkg & .snupkg files in the same directory, and then push the .nupkg. The .snupkg file should be pushed automatically after the .nupkg is pushed.

  nuget push Package.nupkg -Source localhost

5. Once the package is published, in the rails console verify that the symbol records have been created:

Packages::Nuget::Symbol.last

When the feature flag is enabled

1. Enable the feature flag: Feature.disable(:nuget_extract_nuget_package_model)

Repeat the steps 2-5 from when the feature flag is disabled.