Fix attention fusion in conformer encoder #23711
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Description
This PR updates the attention fusion for conformer-encoder models. It is a follow-up to this PR.
Motivation and Context
Subsequent modeling code updates have changed (and will continue to change) the graph fusions. However, the three ending attention mask nodes (
Cast --> Unsqueeze --> Equal) will remain. Thus, the attention fusion should work regardless of any future modeling code changes when handling the attention mask.