Back out "[core][pruning][be] rename BaseSparsifier to BasePruner (#98747)" (#99171)
Summary: Back out D44856390 since renaming the type breaks backwards compatibility of existing models used in integration tests and likely in prod as well.
Test Plan:
buck2 run //aiplatform/modelstore/model_generation/integration_tests:cogwheel_igr_tab_offline_and_recurring_model_generation_v1_api_test-launcher -- --build-fbpkg --run-disabled --run-harness-in-tupperware
Now fails with an OOM: https://www.internalfb.com/servicelab/experiment/100000000259121/trial/100000000331723/run
It was failing with an import error without this revert.
Differential Revision: D44991351
Pull Request resolved: https://github.com/pytorch/pytorch/pull/99171
Approved by: https://github.com/izaitsevfb, https://github.com/osalpekar
