add libcuml Python builds (#442)

Contributes to rapidsai/build-planning#33

Adjusts `rapids-build-utils` manifest for release 25.02 to account for
the introduction of new `libcuml` wheels
(rapidsai/cuml#6199).

## Notes for Reviewers

This shouldn't be merged still pointing at my forks.

Plan:

1. merge #440, then update
this branch
2. see CI pass here
3. see all CI except devcontainers pass on
rapidsai/cuml#6199
4. point this PR back at upstream and admin-merge it
5. re-run devcontainers CI on rapidsai/cuml#6199
and see it pass

features/src/rapids-build-utils/devcontainer-feature.json

@@ -1,7 +1,7 @@
 {
   "name": "NVIDIA RAPIDS devcontainer build utilities",
   "id": "rapids-build-utils",
-  "version": "25.2.7",
+  "version": "25.2.8",
   "description": "A feature to install the RAPIDS devcontainer build utilities",
   "containerEnv": {
     "BASH_ENV": "/etc/bash.bash_env"

features/src/rapids-build-utils/opt/rapids-build-utils/manifest.yaml

@@ -159,10 +159,14 @@ repos:
       parallelism:
         max_device_obj_memory_usage: 3Gi
   python:
+    - name: libcuml
+      sub_dir: python/libcuml
+      depends: [cuml]
+      args: {install: *rapids_build_backend_args}
     - name: cuml
       sub_dir: python/cuml
       depends: [cuml]
-      args: {cmake: -DFIND_CUML_CPP=ON, install: *rapids_build_backend_args}
+      args: {install: *rapids_build_backend_args}
 
 - name: cugraph
   path: cugraph