Compiler-generated editorconfig has duplicate entries

Not a big issue, but I was looking in microsoft/testfx at `\artifacts\obj\Microsoft.Testing.Platform\Debug\net8.0\Microsoft.Testing.Platform.GeneratedMSBuildEditorConfig.editorconfig`. The file looks like this:

```ini
is_global = true
build_property.EnableAotAnalyzer = true
build_property.EnableSingleFileAnalyzer = true
build_property.EnableTrimAnalyzer = true
build_property.IncludeAllContentForSelfExtract =
build_property.TargetFramework = net8.0
build_property.TargetFramework = net8.0
build_property.TargetFramework = net8.0
build_property.TargetPlatformMinVersion =
build_property.TargetPlatformMinVersion =
build_property.TargetPlatformMinVersion =
build_property.UsingMicrosoftNETSdkWeb =
build_property.UsingMicrosoftNETSdkWeb =
build_property.UsingMicrosoftNETSdkWeb =
build_property.ProjectTypeGuids =
build_property.ProjectTypeGuids =
build_property.ProjectTypeGuids =
build_property.InvariantGlobalization =
build_property.InvariantGlobalization =
build_property.InvariantGlobalization =
build_property.PlatformNeutralAssembly =
build_property.PlatformNeutralAssembly =
build_property.PlatformNeutralAssembly =
build_property.EnforceExtendedAnalyzerRules =
build_property.EnforceExtendedAnalyzerRules =
build_property.EnforceExtendedAnalyzerRules =
build_property._SupportedPlatformList = Linux,macOS,Windows,android,ios,browser,tvos,wasi
build_property._SupportedPlatformList = Linux,macOS,Windows,android,ios,browser,tvos,wasi
build_property._SupportedPlatformList = Linux,macOS,Windows,android,ios,browser,tvos,wasi
build_property.TargetFrameworkIdentifier = .NETCoreApp
build_property.TargetFrameworkVersion = v8.0
build_property.RootNamespace = Microsoft.Testing.Platform
build_property.ProjectDir = C:\Users\ygerges\Desktop\testfx\src\Platform\Microsoft.Testing.Platform\
build_property.EnableComHosting =
build_property.EnableGeneratedComInterfaceComImportInterop =
build_property.EffectiveAnalysisLevelStyle = 10.0
build_property.EnableCodeStyleSeverity =

```