feat: Add newFlowModal examples for Sequential Agent, Hierarchical Agent, and Complex Agent

[ogabrielluiz]

This commit adds new examples to the newFlowModal component for Sequential Agent, Hierarchical Agent, and Complex Agent. Each example is rendered as an UndrawCardComponent with the corresponding flow data. This enhancement provides users with more options when creating new flows.

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_{Last Modified at 17 Jul 24 13:30 UTC}

[lucaseduoli]

LGTM!