[release/9.0-staging] Disable the UTFStringConversionFailures test on CI runs (#116460)

* Disable the UTFStringConversionFailures test on CI runs as our Helix machines can't handle the load from allocating 2 2GB strings and the OOM killer was killing the process.

* Rename test as well

---------

Co-authored-by: Jeremy Koritzinsky <jekoritz@microsoft.com>
Co-authored-by: Jeremy Koritzinsky <jkoritzinsky@gmail.com>

Author: github-actions[bot]

src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/CollectionMarshallingFails.cs

@@ -110,7 +110,8 @@ public static partial void NegateBoolsRef2D_ClearMarshalling(
     public class CollectionMarshallingFails
     {
         [Fact]
-        public void UTFStringConversionFailures()
+        [SkipOnCI("Allocates enough memory that the OOM killer can kill the process on our Helix machines.")]
+        public void BigUTFStringConversionFailures()
         {
             bool threw = false;
             try