Update namespace style and enable NU1608 warning (coverlet-coverage#1806)

* Update namespace style and enable NU1608 warning

Changed namespace declarations to block-scoped in .editorconfig for silent enforcement. Removed NU1608 from NoWarn in Directory.Build.props to report this warning during builds.

* Remove NU5129 and NU5127 from NoWarn property in project file

* Remove NU1900 from NoWarn property in Directory.Build.props

Author: Bertk

.editorconfig

@@ -237,4 +237,3 @@ csharp_style_prefer_top_level_statements = true:silent
 csharp_style_prefer_primary_constructors = true:suggestion
 csharp_style_expression_bodied_lambdas = true:silent
 csharp_style_expression_bodied_local_functions = false:silent
-dotnet_diagnostic.IDE0007.severity = suggestion

Directory.Build.props

@@ -19,7 +19,7 @@
     <CodeAnalysisTreatWarningsAsErrors>false</CodeAnalysisTreatWarningsAsErrors>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <LangVersion>12.0</LangVersion>
-    <NoWarn>$(NoWarn);NU1507;NU5105;CS1591;NU1608;NU1900</NoWarn>
+    <NoWarn>$(NoWarn);NU1507;NU5105;CS1591</NoWarn>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <RestoreSources>
       https://api.nuget.org/v3/index.json;

src/coverlet.msbuild.tasks/coverlet.msbuild.tasks.csproj

@@ -18,7 +18,7 @@
     <EnablePackageValidation>true</EnablePackageValidation>
     <GenerateDependencyFile>true</GenerateDependencyFile>
     <CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
-    <NoWarn>$(NoWarn);NU5100;NU5129;NU5127</NoWarn>
+    <NoWarn>$(NoWarn);NU5100</NoWarn>
     <!-- create SBOM for CI build-->
     <GenerateSBOM>true</GenerateSBOM>
   </PropertyGroup>