Add voting timestamp log

[FSadrieh]

#1857

[richardebeling]

Looking mostly good so far 👍

[janno42]

✔️ Meets requirements
✔️ UI functionality checked

[niklasmohrin]

Uff, this is not reviewable, we first need to untangle the git history here (I think you have some evil merge commits in there) - we can do it next week

[FSadrieh]

import datetime
from random import randrange

for evaluation in Evaluation.objects.filter(state__gte=50, course__semester__is_active=True):
    voter_count = evaluation.voters.count()
    for i in range(voter_count):
        start = evaluation.vote_start_datetime
        end = datetime.datetime.combine(evaluation.vote_end_date, datetime.time())
        delta = min(end, datetime.datetime.now()) - start
        int_delta = (delta.days * 24 * 60 * 60) + delta.seconds
        random_second = randrange(int_delta)
        timestamp = start + datetime.timedelta(seconds=random_second)
        VoteTimestamp.objects.create(evaluation=evaluation, timestamp=timestamp)

[niklasmohrin]

Some minor things left:

[janno42]

✔️ Meets requirements
✔️ UI functionality checked

[niklasmohrin]

Once the comment about the testdata is resolved, we can merge