Add expression support to network wait task

[marshall007]

This is followup from dezarfing in #73. Need to move wait logic into maru-runner as first step.

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Additional context

• https://github.com/defenseunicorns/zarf/blob/main/src/pkg/utils/wait.go#L32
• https://github.com/kptdev/kpt/blob/main/pkg/status/poller.go