Make types in platform services internal

[Youssef1313]

Related to #1285

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.96%. Comparing base (f66ff43) to head (6604329).

Additional details and impacted files

@@            Coverage Diff             @@
##           dev/v4    #5845      +/-   ##
==========================================
+ Coverage   72.56%   72.96%   +0.40%     
==========================================
  Files         604      604              
  Lines       38320    37304    -1016     
==========================================
- Hits        27806    27220     -586     
+ Misses      10514    10084     -430     

Flag	Coverage Δ
Debug	72.96% <100.00%> (+0.40%)	⬆️
integration	72.96% <100.00%> (-0.09%)	⬇️
production	72.96% <100.00%> (+0.40%)	⬆️
unit	72.96% <100.00%> (+0.40%)	⬆️

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Files with missing lines	Coverage Δ
....PlatformServices/Deployment/TestRunDirectories.cs	100.00% <ø> (ø)
...ter.PlatformServices/Execution/TestAssemblyInfo.cs	98.98% <ø> (+7.24%)	⬆️
...dapter.PlatformServices/Execution/TestClassInfo.cs	91.53% <ø> (+5.81%)	⬆️
...formServices/Execution/TestRunCancellationToken.cs	94.44% <ø> (+31.58%)	⬆️
...r/MSTestAdapter.PlatformServices/MSTestSettings.cs	94.84% <ø> (ø)
...Adapter.PlatformServices/ObjectModel/TestMethod.cs	92.85% <ø> (-0.99%)	⬇️
...ter.PlatformServices/ObjectModel/UnitTestResult.cs	71.42% <ø> (ø)
...Adapter.PlatformServices/RecursiveDirectoryPath.cs	61.53% <ø> (-38.47%)	⬇️
...apter.PlatformServices/RunConfigurationSettings.cs	96.92% <ø> (ø)
...dapter.PlatformServices/Services/FileOperations.cs	57.35% <ø> (+4.22%)	⬆️
... and 10 more

... and 32 files with indirect coverage changes

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