sharding length conflict resolution2

[shuningjin]

Description

Previous PR changed the definition of activation_length, which introduces sharding conflict. Here we restore the definition.

Swap length def in "base.yml, common_types, attention, attention_mla, attention_op"

• LENGTH -> LENGTH_WITH_EXP
• LENGTH_NO_EXP -> LENGTH

other changes for consistency: "qwen3, moe, pyconfig"

Tests

Please describe how you tested this change, and include any instructions and/or
commands to reproduce.

Checklist

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• I have performed a self-review of my code.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed.