[JAX] Scale sequence length in CP tests to avoid tiny sizes.

[mgoldfarb-nvidia]

Description

Avoids running with tiny sequence lengths when CP size is large in the Jax distributed fused attention tests.

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 refractor

Changes

Update unit test to scale sequence length by CP size.

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

[zlsh80826]

/te-ci jax L1

[mgoldfarb-nvidia]

/te-ci jax L1