[BUG] Giving big number as input for ActivityIntervalForm causes a 500 error

[stveit]

Describe the bug

If you set the value in the days input to a big number (e.g. 123123123) then you will get a 500 error.
You will get different errors based on how big the number is. 123123123 gives an OverflowError with the message
date value out of range. while 123123123123 gives an error with the message Python int too large to convert to C int

To Reproduce

Steps to reproduce the behavior

1. Go to one of the various sites that use ActivityIntervalForm, e.g. http://localhost/ipdevinfo/uninett-tor-sw1.uninett.no/modules/swportactive/
2. Enter 123123123 into the Days input box
3. Click on Recheck activity
4. See error

Expected behavior

If there is a logical limit to how big the number should be, then either the form shouldnt allow you to
click Recheck activity until you enter a valid number, or an error should be shown saying something along the lines of Days must be between X and Y after you click the button.

If there shouldnt be a limit on how big the number can be, then it should work the same as it does with a smaller number.

Tracebacks

Environment:

Traceback (most recent call last):
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/source/python/nav/web/ipdevinfo/views.py", line 429, in get_port_view
    'activity_interval_start': dt.datetime.now()

Exception Type: OverflowError at /ipdevinfo/uninett-tor-sw1.uninett.no/modules/swportactive/
Exception Value: date value out of range

Traceback (most recent call last):
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
    response = get_response(request)
  File "/opt/venvs/nav/lib/python3.9/site-packages/django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/source/python/nav/web/ipdevinfo/views.py", line 430, in get_port_view
    - dt.timedelta(days=activity_interval),

Exception Type: OverflowError at /ipdevinfo/uninett-tor-sw1.uninett.no/modules/swportactive/
Exception Value: Python int too large to convert to C int