chg: Split dumpstacks into handle_sigint

stop exiting when there's a possible exception that makes sbws stalled
and instead just dump the stack. Additionaly, call pdb on sigint.
12 jobs for m12_issue40092_futures_01 in 15 minutes and 53 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Test
passed python310 #26262

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passed python36 #26254

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passed python37tor035 #26255

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passed python37tor045 #26264

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passed python37tor046 #26257

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passed python37tormaster #26258

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passed python37torstable #26259

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passed python38 #26260

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passed python39 #26261

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failed python37tor045 #26256

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  Deploy
passed pages #26263

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passed pages:deploy

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