scripts: policy-node: wait for unactivated links instead of removing

Merged P V requested to merge pvir/wireplumber:wait-rescan into master

If a link is not activated, don't remove it. Instead, schedule a rescan when a link activates, so that we'll handle it once it does.

This is a workaround for some problems, see However, the underlying cause is not understood.

See !398 (comment 1623601)

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