Disable several failing tests on iOSSimulator arm64 (dotnet#61826)

Author: steveisok

src/libraries/System.Runtime.Extensions/tests/System/AppDomainTests.cs

@@ -379,7 +379,7 @@ public void ReflectionOnlyGetAssemblies()
         }
 
         [Fact]
-        [SkipOnPlatform(TestPlatforms.Browser, "Throws PNSE")]
+        [SkipOnPlatform(TestPlatforms.Browser | TestPlatforms.iOS | TestPlatforms.tvOS, "Throws PNSE")]
         public void MonitoringIsEnabled()
         {
             Assert.True(AppDomain.MonitoringIsEnabled);

src/libraries/System.Runtime.Extensions/tests/System/EnvironmentTests.cs

@@ -96,6 +96,7 @@ public void ProcessPath_Idempotent()
         }
 
         [Fact]
+        [SkipOnPlatform(TestPlatforms.iOS | TestPlatforms.tvOS, "Throws PNSE")]
         public void ProcessPath_MatchesExpectedValue()
         {
             string expectedProcessPath = PlatformDetection.IsBrowser ? null : Process.GetCurrentProcess().MainModule.FileName;

src/libraries/tests.proj

@@ -147,6 +147,11 @@
     <ProjectExclusions Include="$(RepoRoot)\src\tests\FunctionalTests\Android\Device_Emulator\AOT\Android.Device_Emulator.Aot.Test.csproj" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetOS)' == 'iOSSimulator' and '$(TargetArchitecture)' == 'arm64' and '$(RunDisablediOSTests)' != 'true'">
+    <!-- Functional tests on arm64 simulator have problems with return codes from mlaunch -->
+    <ProjectExclusions Include="$(RepoRoot)\src\tests\FunctionalTests\$(TargetOS)\Simulator\**\*.Test.csproj" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetOS)' == 'MacCatalyst'">
     <ProjectExclusions Include="$(RepoRoot)/src/tests/FunctionalTests/iOS/Simulator/XmlFormatWriterGeneratorAOT/iOS.Simulator.XmlFormatWriterGeneratorAot.Test.csproj" />
   </ItemGroup>