Slightly reduce the Depth3Test that often times out on Linux (#90777)

* Slightly reduce the Depth3Test that often times out on Linux

This is one of the regression tests I introduced as part of
implementing protection against infinite generic recursion in
Crossgen2. Turns out that on the relatively slow Helix Linux
VMs the test often times out due to compilation time exceeding
10 minutes. I propose slightly trimming down the test so that
it uses less time in Helix.

Thanks

Tomas

* Remove issues.targets exclusion for the Depth3Test

src/tests/issues.targets

@@ -72,9 +72,6 @@
         <ExcludeList Include="$(XunitTestBinBase)/JIT/Regression/JitBlue/Runtime_82535/Runtime_82535/*">
           <Issue>https://github.com/dotnet/runtime/issues/89585</Issue>
         </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/readytorun/GenericCycleDetection/Depth3Test/*">
-          <Issue>https://github.com/dotnet/runtime/issues/88586</Issue>
-        </ExcludeList>
     </ItemGroup>
 
     <!-- All Unix targets on all runtimes -->

src/tests/readytorun/GenericCycleDetection/Depth3Test.cs

@@ -23,15 +23,13 @@ public static long TypeNestedFactorial(int count)
             if (result < count) result = Depth1<Depth2<T>>.TypeNestedFactorial(count - 1);
             if (result < count) result = Depth1<Depth3<T>>.TypeNestedFactorial(count - 1);
             if (result < count) result = Depth1<Depth4<T>>.TypeNestedFactorial(count - 1);
-            if (result < count) result = Depth1<Depth5<T>>.TypeNestedFactorial(count - 1);
             return count * result;
         }
     }
 
     private struct Depth2<T> {}
     private struct Depth3<T> {}
     private struct Depth4<T> {}
-    private struct Depth5<T> {}
 
     [Fact]
     public static int DepthTest()