[ascend]Native Integration of MegatronAdaptor (TransformerEngine-FL Module) on FlagOS

[ltllt1]

Description

This PR optimizes the training entry of FlagScale, enabling native NPU training capability without introducing MegatronAdaptor dependencies.
1、Retain complete distributed training ability on NPU
2、No breaking changes to existing FlagScale training workflows
Fixes # (issue)

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

Changes

Please list the changes introduced in this PR:

• Change A
• Change B

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

[CLAassistant]

All committers have signed the CLA.

[lxd-cumt]

LGTM