revert(moe): revert #3738 SM90 CUTLASS MoE backend (+ dependents #4025, #4080) on release-v0.6.16

[bkryu]

📌 Description

Revert sequence for

• fix: Add missing nvfp4 sizing branch in getProfilerWorkspaces #4080
• perf: optimize MXFP4xBF16 & INT4xFP8 and add MXFP4xFP8 CUTLASS MoE backend for SM90 #3738
• fix(moe): restore legacy fused_moe.core imports for interleave helpers #4025

git checkout -b revert-3738-release-v0.6.16 upstream/release-v0.6.16   # c498513a
git revert --no-edit 2475121f          # #4080 (clean)
git revert --no-edit 5823159c          # #3738 -> conflicts in core.py/__init__.py/prepare.py
#   resolve keeping #4057's workspace API + profile_ids; strip use_wfp4afp8_humming;
#   restore interleave helpers to core.py & their exports; drop #3738's functools/struct import
git add flashinfer/fused_moe/{core,__init__,prepare}.py && git revert --continue --no-edit
git revert --no-edit c83607a9          # #4025 (clean) — must come after #3738

Note: #4057 is intentionally kept

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[bkryu]

/bot run tests/moe

[flashinfer-bot]

GitLab MR !1170 has been created, and the CI pipeline #61632461 is currently running. I'll report back once the pipeline job completes.

[bkryu]

/bot run tests/moe

[flashinfer-bot]

GitLab MR !1170 has been updated with latest changes, and the CI pipeline #61633292 is currently running. I'll report back once the pipeline job completes.

[bkryu]

/bot run tests/moe

[flashinfer-bot]

GitLab MR !1170 has been updated with latest changes, and the CI pipeline #61635567 is currently running. I'll report back once the pipeline job completes.

[bkryu]

/bot run tests/moe

[flashinfer-bot]

GitLab MR !1170 has been updated with latest changes, and the CI pipeline #61642681 is currently running. I'll report back once the pipeline job completes.

[aleozlx]

lgtm