Add support for PrunePackageReference in the new resolver

[nkolev92]

Bug

Fixes: NuGet/Home#7344

Description

For reference, the design is at https://github.com/NuGet/Home/blob/dev/accepted/2024/prune-package-reference.md
This PR implements the full scope of the pruning in the new resolver.
Primary functions are not downloading and skipping packages to be pruned, and not representing them as dependencies in the targets section of the framework they were skipped for.
This PR does not add a list of pruned packages anywhere, and that's intentional at this point. The design lists that as a future possibility too.

Some pointers:

• Meat of the changes is in DependecyGraphResolver. As we walk the graph, if a graph item is eligible (package and lower min version than the one specified in the PrunePackageReference, we skip it). We do that by tracking the indices of the packages we skip. This is the safe way, since it preserves the index calculation for the items in the graph.
  At flattening time, we then skip those dependencies and we "recreate" the RemoteResolveResult dependencies section to ensure the assets file contains the correct information.
• LockFileUtils.CreateLockFileTargetLibrary now contains the dependencies count in the hashing to avoid issues where things were pruned in one framework but not in the other.
• SdkAnalysisLevelMinimums.cs adds warnings for project pruning and direct package reference pruning only in .NET 10 SDK Analysis level scenarios. The feature is still disabled by default for all frameworks anyways.
• The tests RestoreCommandTests.cs are exhaustive and they contain all scenarios called out in the spec & combinations of pruning normal and runtime dependencies, across different or same frameworks.

PR Checklist

• Meaningful title, helpful description and a linked NuGet/Home issue
• Added tests
• Link to an issue or pull request to update docs if this PR changes settings, environment variables, new feature, etc. - Document PrunePackageReference and all the details around it  Home#14002