Fix ck4inductor conv instance parsing for NumGroupsToMerge parameter (#6434)

## Summary
- Add `num_groups_to_merge` field to `CKGroupedConvFwdOp` dataclass to
match the new (#4273) `NumGroupsToMerge` template parameter added to
`DeviceGroupedConvFwdMultipleABD_Xdl_CShuffle_V3`
- Enable inductor tests by default in Jenkins CI

## Test plan
- [x] Built wheel without patch: `test_gen_conv_instances` fails with
`TypeError: takes from 47 to 50 positional arguments but 51 were given`
- [x] Built wheel with patch: `test_gen_conv_instances` passes

python/ck4inductor/grouped_conv_fwd/op.py

@@ -67,6 +67,7 @@ class CKGroupedConvFwdOp:
     b_compute_dtype: Optional[str] = None
 
     direct_load: Optional[bool] = None
+    num_groups_to_merge: Optional[int] = None
 
     def name(self):
         # cpp alias for template instance