Remove fixed bug from issues.targets (#91294)

Author: MichalStrehovsky

src/tests/issues.targets

@@ -1108,9 +1108,6 @@
         <ExcludeList Include="$(XunitTestBinBase)/managed/Compilation/Compilation/**">
             <Issue>expects to see System.Private.CoreLib in CORE_ROOT</Issue>
         </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/Interop/COM/ComWrappers/GlobalInstance/GlobalInstanceTrackerSupportTests_TargetUnix/**">
-            <Issue>https://github.com/dotnet/runtime/issues/86990</Issue>
-        </ExcludeList>
 
         <!-- Complex constrained calls -->
         <!-- https://github.com/dotnet/runtimelab/issues/1431 -->