Remove concept of snapshot filters from dependency tree data handling

[drewnoakes]

We have been slowly working towards removing this concept from the dependency tree as it complicates understanding of view state from the publisher's perspective.

PR #7990 left only one such filter, meaning we can inline that instance, simplify it (as we don't need a general pattern), and remove the interface and supporting types needed for filters.

Before

%% TODO add click handlers:
%%   click A "https://github.com/dotnet/project-system/..." "Click to view source"

flowchart LR
  subgraph UnconfiguredProject Scope
    filters[IDependenciesSnapshotFilter]
    handlers[IDependenciesRuleHandler]
    subgraph ConfiguredProject Scope
      direction TB
      subgraph CPS Data Sources
        evaluation([Evaluation Data])
        design-time-build([Design-time Build Data])
      end
    end
    evaluation == "snapshot + delta" ==> DependencyRulesSubscriber
    design-time-build == "snapshot + delta" ==> DependencyRulesSubscriber
    handlers -- "import many" -.-> DependencyRulesSubscriber
    filters -- "import many" -.-> DependencyRulesSubscriber
    DependencyRulesSubscriber -- "IDependenciesChanges (delta)" --> DependenciesSnapshotProvider
    IDependenciesTreeViewProvider["IDependenciesTreeViewProvider.BuildTreeAsync"]
    DependenciesSnapshotProvider == DependenciesSnapshot ==> IDependenciesTreeViewProvider
    IDependenciesTreeViewProvider -- IProjectTree --> ProjectTreeProviderBase.SubmitTreeUpdateAsync
  end

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After

flowchart LR
  subgraph UnconfiguredProject Scope
    handlers[IDependenciesRuleHandler]
    subgraph ConfiguredProject Scope
      direction TB
      subgraph CPS Data Sources
        evaluation([Evaluation Data])
        design-time-build([Design-time Build Data])
      end
    end
    evaluation == "snapshot + delta" ==> DependencyRulesSubscriber
    design-time-build == "snapshot + delta" ==> DependencyRulesSubscriber
    handlers -- "import many" -.-> DependencyRulesSubscriber
    DependencyRulesSubscriber -- "IDependenciesChanges (delta)" --> DependenciesSnapshotProvider
    IDependenciesTreeViewProvider["IDependenciesTreeViewProvider.BuildTreeAsync"]
    DependenciesSnapshotProvider == DependenciesSnapshot ==> IDependenciesTreeViewProvider
    IDependenciesTreeViewProvider -- IProjectTree --> ProjectTreeProviderBase.SubmitTreeUpdateAsync
  end

  click handlers "https://github.com/dotnet/project-system/blob/main/src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/Tree/Dependencies/CrossTarget/IDependenciesRuleHandler.cs" "Click to view source"
  click DependencyRulesSubscriber "https://github.com/dotnet/project-system/blob/main/src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/Tree/Dependencies/Subscriptions/DependencyRulesSubscriber.cs" "Click to view source"
  click IDependenciesTreeViewProvider "https://github.com/dotnet/project-system/blob/main/src/src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/Tree/Dependencies/IDependenciesTreeViewProvider.cs" "Click to view source"
  click DependenciesSnapshotProvider "https://github.com/dotnet/project-system/blob/main/src/src/src/Microsoft.VisualStudio.ProjectSystem.Managed/ProjectSystem/Tree/Dependencies/Subscriptions/DependenciesSnapshotProvider.cs" "Click to view source"

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