fix: optimize filtering of vertices in useFlowStore

[ogabrielluiz]

Refactor the filtering logic in the useFlowStore hook to optimize the performance. The code changes ensure that the nextVertices array is filtered correctly by excluding vertices that already exist in the last layer.

[github-actions]

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_{Last Modified at 12 Jul 24 16:17 UTC}

[anovazzi1]

LGTM