[v0.11.0-dev][CI] Fix ngram lacking of input arg dummy_compute_logits error

[MengqingCao]

What this PR does / why we need it?

Fix ngram lacking of input arg dummy_compute_logits error

How was this patch tested?

CI passed with existing test.

[gemini-code-assist]

Code Review

This pull request addresses a lacking of input arg error by introducing the dummy_compute_logits parameter with a default no-op lambda function to the dummy_run methods in interface.py and ngram_proposer.py. This change ensures compatibility and resolves the reported error without introducing new issues. The addition of the -> None return type hint in interface.py also improves code clarity.

[github-actions]

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