fix: improve handling of unowned derived signals #10565
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Fixes #10549.
This PR introduces write versions to the both types of signal. For source signals we increment this version number every time a new value is written to the signal. For computation signals we only use the write version for unowned signals (signals that aren't owned by an effect). We check the dependencies of an unowned derived to see if a version is higher than that of the unowned derived signal to determine if the derived is dirty or not.