Use conda-build instead of conda-mambabuild (#784)

This changes from `conda mambabuild` to `conda build`. Conda now uses the mamba solver so no performance regressions are expected.

This is a temporary change as we plan to migrate to `rattler-build` in the near future. However, this is needed sooner to drop `boa` and unblock Python 3.13 migrations.

xref: rapidsai/build-planning#149

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Jake Awe (https://github.com/AyodeAwe)

URL: #784

Author: bdice

ci/build_cpp.sh

@@ -16,7 +16,7 @@ rapids-print-env
 rapids-logger "Begin cpp build"
 conda config --set path_conflict prevent
 
-RAPIDS_PACKAGE_VERSION=$(rapids-generate-version) rapids-conda-retry mambabuild \
+RAPIDS_PACKAGE_VERSION=$(rapids-generate-version) rapids-conda-retry build \
   conda/recipes/rapids_core_dependencies
 
 rapids-upload-conda-to-s3 cpp