Fix group_norm issue for Apex when building Dockerfile

[xingyaoww]

What does this PR do ?

Fix ModuleNotFoundError: No module named 'group_norm_cuda' error for Apex when building Dockerfile from main.

Collection: [Note which collection this PR will affect]

Changelog

Add group_norm option when building apex.

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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Additional Information

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[timmoon10]

I reproduce this error and I'm trying a build right now. Can you update the Apex install instructions in https://github.com/NVIDIA/NeMo/blob/main/README.rst with this change?

This bug was exposed in #8734, which made the LLM submodules import Stable Diffusion submodules.

[xingyaoww]

Hey @timmoon10 thanks for the reminder! I've update the readme!

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