Strip comments from function definitions

[tmr232]

The current method to extract a function definition (span from start of function to the function body) may include comments.
This specifically happens in CPython tests (https://github.com/tmr232/cfgbot/actions/runs/12576476224/job/35052659314).
So we need to strip them.

The "good" solution would be to drop comments as we generate the function def.
The "bad" solution, which I'll probably go with first, is to strip Python comments in the publishing step, as it's was easier.