Revert "[MoE] MiniMax-M2/M2.1 calibration follow-up (#2335)" (#2485)

This reverts commit 2ab0244.

SUMMARY:
- Multiple issues which were masked as the tests were skipped due to
requiring transformers v5

Author: dsikka

examples/quantizing_moe/minimax_m2_example.py

@@ -14,7 +14,6 @@
 from .glm4_moe import CalibrationGlm4MoeMoE  # noqa: F401
 from .glm_moe_dsa import CalibrationGlmMoeDsaMoE  # noqa: F401
 from .llama4 import SequentialLlama4TextMoe  # noqa: F401
-from .minimax_m2 import CalibrationMiniMaxM2SparseMoeBlock  # noqa: F401
 from .qwen3_moe import CalibrationQwen3MoeSparseMoeBlock  # noqa: F401
 from .qwen3_5_moe import CalibrationQwen3_5MoeSparseMoeBlock
 from .qwen3_vl_moe import CalibrateQwen3VLMoeTextSparseMoeBlock  # noqa: F401