Fix ModuleNotFoundError for tritonparse.fb in atexit cleanup

[zhudada0120]

Summary

This PR fixes an OSS-only shutdown error in TritonTraceHandler._cleanup().

When TRITONPARSE_TRACE_MANIFOLD is enabled, cleanup may try to import the fb-only uploader in OSS environments and print ModuleNotFoundError: No module named 'tritonparse.fb' during atexit, even though trace generation and parsing have already succeeded.

related issue：#373

Changes

• import is_fbcode from shared_vars
• gate the Manifold upload path in _cleanup() behind is_fbcode()

This keeps the existing internal upload behavior unchanged while skipping the fb-only uploader path in OSS.

Testing

- ran `python /root/project/tritonparse/tests/test_add.py` in an OSS environment - confirmed the script still generates trace and parsed output successfully - confirmed the `atexit` cleanup no longer raises `ModuleNotFoundError` for `tritonparse.fb`

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[zhudada0120]

Hi @FindHao, PTAL. Thanks!

[FindHao]

LGTM! thanks for capturing this

[meta-codesync]

@FindHao has imported this pull request. If you are a Meta employee, you can view this in D99848479.

[xuzhao9]

Thanks for the fix!

[meta-codesync]

@FindHao merged this pull request in 2418f61.