Don't handle BaseException

[ktbarrett]

There are several places in the cocotb codebase that handle BaseExceptions and do stuff to them/squash them ("manage" them). This is not ideal. Instead we should be catching only Exception and select BaseExceptions that are safe to catch, for example: AssertionError and pytest.Failed.

Places where this unsafe handling occurs:

cocotb/src/cocotb/_scheduler.py

Line 537 in 102625f

except BaseException as e:

cocotb/src/cocotb/_outcomes.py

Line 18 in 102625f

except BaseException as e:

cocotb/src/cocotb/task.py

Line 137 in 102625f

except BaseException as e:

cocotb/src/cocotb/triggers.py

Line 809 in 102625f

except BaseException as exc:

I suggest we move the pytest.Failed logic from cocotb.regression into cocotb._conf and setup a variable which will include all Exception types that should be caught in these circumstances.

managed_exceptions = (Exception, Failed, AssertionError, TestSuccess, SimFailure)

Closing #3787 and #3788 would help shrink that list and not create some potentially weird cyclic reference between cocotb._conf and cocotb.result.