[Wasm] Skip System.IO.Compression.Brotli tests b/c the library is PNSE (#38941)

Author: steveisok

src/libraries/System.IO.Compression.Brotli/tests/AssemblyInfo.cs

@@ -0,0 +1,7 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using Xunit;
+
+[assembly: SkipOnMono("System.IO.Compression.Brotli is not supported on Browser", TestPlatforms.Browser)]

src/libraries/System.IO.Compression.Brotli/tests/System.IO.Compression.Brotli.Tests.csproj

@@ -3,6 +3,7 @@
     <TargetFrameworks>$(NetCoreAppCurrent)-Windows_NT;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)-Browser</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup>
+    <Compile Include="AssemblyInfo.cs" />
     <Compile Include="BrotliEncoderTests.cs" />
     <Compile Include="BrotliGoogleTestData.cs" />
     <Compile Include="CompressionStreamUnitTests.Brotli.cs" />

src/libraries/tests.proj

@@ -47,12 +47,10 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Globalization.Calendars\tests\System.Globalization.Calendars.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Globalization.Extensions\tests\System.Globalization.Extensions.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Globalization\tests\System.Globalization.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.Compression.Brotli\tests\System.IO.Compression.Brotli.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.Compression.ZipFile\tests\System.IO.Compression.ZipFile.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.Compression\tests\System.IO.Compression.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.FileSystem.DriveInfo\tests\System.IO.FileSystem.DriveInfo.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.FileSystem\tests\System.IO.FileSystem.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.IsolatedStorage\tests\System.IO.IsolatedStorage.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.MemoryMappedFiles\tests\System.IO.MemoryMappedFiles.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.Packaging\tests\System.IO.Packaging.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.IO.Pipes\tests\System.IO.Pipes.Tests.csproj" />