fix: implicitly run dotnet restore

[yufeih]

Building a project without any NuGet package reference requires dotnet restore in certain cases for MSBuildWorkspace to generate a compilation: dotnet/roslyn#36072, otherwise predefined types are not imported:

error CS0518: Predefined type 'System.Object' is not defined or imported

Run an implicit dotnet restore for csproj and sln, which can be turned off using the noRestore config.

#3177

[codecov]

Codecov Report

Base: 77.10% // Head: 77.12% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (8d62ef6) compared to base (70c81a5).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8419      +/-   ##
==========================================
+ Coverage   77.10%   77.12%   +0.02%     
==========================================
  Files         860      860              
  Lines       30773    30778       +5     
==========================================
+ Hits        23726    23738      +12     
+ Misses       7047     7040       -7     

Impacted Files	Coverage Δ
src/Microsoft.DocAsCode.Dotnet/DotnetApiCatalog.cs	96.22% <100.00%> (+0.07%)	⬆️
...de.Dotnet/ExtractMetadata/ExtractMetadataConfig.cs	100.00% <100.00%> (ø)
...de.Dotnet/ExtractMetadata/ExtractMetadataWorker.cs	83.64% <100.00%> (+0.15%)	⬆️
...crosoft.DocAsCode.Dotnet/MetadataJsonItemConfig.cs	100.00% <100.00%> (ø)
...osoft.DocAsCode.Tests.Common/TestLoggerListener.cs	94.33% <0.00%> (+1.88%)	⬆️
src/Microsoft.DocAsCode.Common/Git/GitUtility.cs	78.19% <0.00%> (+3.19%)	⬆️

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[yufeih]

Fixes #8465