Add exception from clause to exception handlers and enable B904 rule

[martinhoyer]

Briefly discussed in #3239 (comment), the raise-without-from-inside-except (B904) could be removed from the lint ignore list and existing exceptions violating this rule could be 'fixed'.

[LecrisUT]

Does anyone know how to use raise ... from to catch either exception type? Or if there are other methods to do so? Otherwise is there a design for how the exceptions should be handled with tmt exception, built-in python and third-party, like where to put catch-alls, where to transform the exceptions, etc?