[tests][ios] Disable StartupHook (#82175)

Author: mdh1418

src/libraries/tests.proj

@@ -336,6 +336,8 @@
     <!-- App Crash https://github.com/dotnet/runtime/issues/53624 -->
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.Requests/tests/System.Net.Requests.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj" />
+    <!-- Reference deleted by _CopyTestArchive https://github.com/dotnet/runtime/issues/80976 -->
+    <ProjectExclusions Include="$(RepoRoot)/src/tests/FunctionalTests/iOS/Simulator/StartupHook/iOS.Simulator.StartupHook.Test.csproj" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetOS)' == 'browser' and '$(RunDisabledWasmTests)' != 'true' and '$(RunAOTCompilation)' != 'true'">