chore: adds missing license header on tests and corrects file modes

[terrykong]

What does this PR do ?

Rebase stack

• feat: DPO support for global padding of seq_len to a multiple #386
• feat: adds helper script for running & summarizing functional tests #387
• chore: adds missing license header on tests and corrects file modes #388
• feat: support for mcore optimizer (to enable MoE) #380

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