test(heidenhain): live tool-type gate skips a control that refuses R_RI 51 (#829)

Hermle49 (iTNC 530 NC 340490 03 SP10) refuses the tool selector with code 24;
the driver correctly publishes BadNotSupported for every Tool/* leaf, so there
is no runtime type to check. The test required >0 Good leaves and failed there.

Claude-Session: https://claude.ai/code/session_01GT67AD99zQQqpLCVm3p7xk

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Heidenhain.Tests/HeidenhainLiveIntegrationTests.cs

@@ -117,6 +117,11 @@ public sealed class HeidenhainLiveIntegrationTests
             if (values[i].StatusCode == HeidenhainStatus.Good)
                 values[i].Value!.GetType().ShouldBe(expected[i]);
         }
+
+        // Some controls (e.g. iTNC 530 NC 340490 03 SP10) refuse R_RI 51 with code 24 — the driver correctly
+        // publishes BadNotSupported for every tool leaf, so there is no runtime type to check there.
+        Assert.SkipWhen(values.All(v => v.StatusCode == HeidenhainStatus.BadNotSupported),
+            "Control does not support the R_RI 51 tool selector — tool leaves are BadNotSupported.");
         values.Count(v => v.StatusCode == HeidenhainStatus.Good).ShouldBeGreaterThan(0);
     }
 }