[Feature][Encoder-Decoder]: Add support for cuda graph during decoding in encoder-decoder models

[sroy745]

🚀 The feature, motivation and pitch

Currently for encoder-decoder models we don't support cuda graph during the decode phase. This fr tracks adding support for cuda graph during decode phase. Adding this support will help speed up the decode phase.

#7366

cc: @afeldman-nm

Alternatives

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Additional context

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[github-actions]

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