NuGet nomination code causes unnecessary allocations

[zivkan]

Check VsSolutionRestoreService and VSNominationUtilities for inappropriate usage of LINQ, particularly examples like:

https://github.com/NuGet/NuGet.Client/blob/f702fc3dc44e17a0666dea01e9aa18c5c1175b27/src/NuGet.Clients/NuGet.SolutionRestoreManager/VsSolutionRestoreService.cs#L295-L298

Collections should be created with the correct initial capacity to avoid risk of resizing.

anonymous lamba functions cause allocations too, which can be avoided with for loops.