ElementsProject / ElementsProject/lightning

Investigate what cases could lead to an announcement signing loop

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Description

There appears to be a case where nodes send announcement signatures back and forth in a tight loop. This could cause node symptoms like high CPU usage and perhaps high bandwidth usage.

![Image](https://github.com/user-attachments/assets/f2ac118c-ef58-4335-93ee-d2c1f16ef2b8)

A log of the tight loop is stored here:
https://gist.github.com/ddustin/dca9b0d1d0db7fe580661f493a059373

The log is from a PR and may simply be a side effect of that PR.

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