[Common] Deleted unused header

[Oleg-Goncharov]

Description

Deleted unused header file left from the PR#2248.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[ksivaman]

LGTM

[ksivaman]

/te-ci

[greptile-apps]

Greptile Overview

Greptile Summary

This PR removes the unused header file transformer_engine/common/util/nvfp4_transpose.cuh that was left behind from PR #2248.

• PR #2248 refactored the cast/gated kernels by splitting them into smaller headers organized by scaling mode
• The functionality from nvfp4_transpose.cuh was moved to transformer_engine/common/cast/nvfp4/quantize_transpose_nvfp4.cuh during that refactoring
• The old header file was accidentally not deleted and remained in the codebase
• No files in the current codebase reference nvfp4_transpose.cuh
• This is a clean removal with no impact on functionality

Confidence Score: 5/5

• This PR is safe to merge with zero risk
• This is a simple cleanup PR that removes an unused header file. The file has no references in the codebase, and its functionality was already migrated to a new location in PR #2248. The deletion has no functional impact.
• No files require special attention

Important Files Changed

File Analysis

Filename	Score	Overview
transformer_engine/common/util/nvfp4_transpose.cuh	5/5	Deleted unused header file left behind from PR #2248 refactoring - no references found in codebase

Sequence Diagram

sequenceDiagram
    participant Dev as Developer
    participant PR as PR #2324
    participant Repo as Repository
    participant Old as nvfp4_transpose.cuh
    participant New as quantize_transpose_nvfp4.cuh

    Note over Dev,New: Context: PR #2248 refactored cast kernels
    Dev->>PR: Delete unused header
    PR->>Old: Remove nvfp4_transpose.cuh
    Note over Old: File was left behind from PR #2248
    Note over New: Functionality already in new location
    Old--xRepo: File deleted
    Note over Repo: No references to old file exist
    Note over Repo: Clean removal, zero impact

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[timmoon10]

LGTM