Replace s.consistency with sleep fn in scaffold

[pdaoust]

PR summary

This replaces the (now broken) await s.consistency() with a one-second sleep function in the scaffolded test script. Discovered when I was going through the blessing process for .52.

testing/benchmarking notes

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followups

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changelog

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- summary of change [PR#1234](https://github.com/holochain/holochain-rust/pull/1234)

documentation

• this code has been documented according to our docs checklist

[pdaoust]

Added quick note in the scaffold template to say that you'll probably need to adjust the timeout value.