Fix/empty namespace in nested style

[NanoBob]

• When an empty namespace is included in a nesting of namespaces it now is present in the toc structure properly
• These namespaces are "compacted" when they have a single child, to prevent needless levels of nesting in the toc

Resolves #8417

[codecov]

Codecov Report

Base: 77.24% // Head: 77.27% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (42c60b6) compared to base (4a52ce7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8424      +/-   ##
==========================================
+ Coverage   77.24%   77.27%   +0.02%     
==========================================
  Files         858      858              
  Lines       30628    30660      +32     
==========================================
+ Hits        23660    23692      +32     
  Misses       6968     6968              

Impacted Files	Coverage Δ
...DocAsCode.Dotnet/Resolvers/YamlMetadataResolver.cs	96.39% <100.00%> (-1.08%)	⬇️
src/Microsoft.DocAsCode.Common/Git/GitUtility.cs	74.46% <0.00%> (-0.54%)	⬇️
...rosoft.DocAsCode.Dotnet/YamlViewModelExtensions.cs	85.58% <0.00%> (+0.43%)	⬆️
...DocAsCode.Dotnet/ManagedReference/ItemViewModel.cs	79.76% <0.00%> (+2.38%)	⬆️

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[yufeih]

Thank you @NanoBob

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