fix: use shared sigterm callback #19203
Merged
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Description
@sheremet-va mentioned on discord before that attaching multiple sigterm callbacks, e.g. in vitest where many vite servers are created, can cause node to log
This PR refactors to use a shared callback instead. While this seems a bit of a workaround for the warning, it does allow end-users to focus an actual dangling listeners that they attach themselves.