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.
11 jobs for m12_issue40092_futures in 9 minutes and 18 seconds (queued for 6 seconds)
latest
Status Name Job ID Coverage
  Test
passed python310 #26143

00:07:50

passed python36 #26135

00:08:33

passed python37tor035 #26136

00:08:04

passed python37tor045 #26137

00:08:37

passed python37tor046 #26138

00:08:15

passed python37tormaster #26139

00:07:28

passed python37torstable #26140

00:06:57

passed python38 #26141

00:04:03

passed python39 #26142

00:06:59

 
  Deploy
passed pages #26144

00:00:40

passed pages:deploy

00:00:00