Fix #666 handle SIGTERM#712

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ciandonovan wants to merge 7 commits intoros2:rollingfrom

ciandonovan:rolling

Commits on May 2, 2024

Set due_to_sigint correctly
ciandonovan
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Commits on May 3, 2024

Use `set` over `dict` for `signals_received` store.
ciandonovan
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