[Kernel] Cleanup act_order code from the MarlinMoE kernels

[ElizaWszola]

Remove act_order related code from the MarlinMoE kernel due to it being currently unused. Also assert that is_k_full is always true in these kernels (this is currently true for all codepaths).

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[dsikka]

Seems like we support g_idx for for gptq marlin moe?

[ElizaWszola]

Seems like we support g_idx for for gptq marlin moe?

@dsikka Yes, the original intent of this PR was to temporarily reduce it from MoE kernels because it's not well tested. I've wrote some extra tests for it that revealed that the implementation has a bug somewhere, so I'm planning to fix it and push to this branch. Maybe I'll close this PR and make another one with the fix to avoid confusion.