Unblock System.Configuration CI test errors for Android,tvOS,iOS (#73852)

Disables tests to unblock CI. Will investigate further to see if there is an underlying issue.

See https://github.com/dotnet/runtime/issues/73792Co-authored-by: NAlexander Köplinger <alex.koeplinger@outlook.com>
Co-authored-by: NJose Perez Rodriguez <joperezr@microsoft.com>

src/libraries/tests.proj

@@ -339,6 +339,11 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetOS)' == 'Android' or '$(TargetOS)' == 'iOS' or '$(TargetOS)' == 'iOSSimulator' or '$(TargetOS)' == 'tvOS' or '$(TargetOS)' == 'tvOSSimulator' or '$(TargetOS)' == 'MacCatalyst'">
+    <!-- Build error: https://github.com/dotnet/runtime/issues/73792 -->
+    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Configuration.ConfigurationManager/tests/System.Configuration.ConfigurationManager.Tests.csproj" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetOS)' == 'Browser' and '$(RunDisabledWasmTests)' != 'true' and '$(RunAOTCompilation)' != 'true'">
   </ItemGroup>