[NativeAot] Try re-enabling S.C.Concurrent tests (#73526)

On ARM64 Linux. See if #73216 helped with the hang.

Author: MichalStrehovsky

src/libraries/tests.proj

@@ -487,10 +487,6 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.Mail\tests\Functional\System.Net.Mail.Functional.Tests.csproj"
                       Condition="'$(TargetOS)' == 'windows'"/>
 
-    <!-- Timing out on Linux. GC suspension? -->
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Collections.Concurrent\tests\System.Collections.Concurrent.Tests.csproj"
-                      Condition="'$(TargetOS)' == 'linux' and '$(TargetArchitecture)' == 'arm64'" />
-
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.Http.Json\tests\FunctionalTests\System.Net.Http.Json.Functional.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Linq.Parallel\tests\System.Linq.Parallel.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.Json\tests\System.Text.Json.SourceGeneration.Tests\System.Text.Json.SourceGeneration.Roslyn3.11.Tests.csproj" />