Handle invalid ints in search queries

[alastair]

Issue(s)
Fixes https://logserver.mtg.upf.edu/organizations/sentry/issues/3819/

I'm not sure if we need extra code to remove None values from the parameter list

Description

ValueError: invalid literal for int() with base 10: '1\'"'
  File "django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
  File "django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "geotags/views.py", line 277, in for_query
    'query_description': SearchQueryProcessor(request).get_textual_description(),
  File "utils/search/search_query_processor.py", line 251, in __init__
    option.load_value()
  File "utils/search/search_query_processor_options.py", line 95, in load_value
    value_from_request = self.get_value_from_request()
  File "utils/search/search_query_processor_options.py", line 226, in get_value_from_request
    return int(self.request.GET.get(self.query_param_name))

[alastair]

todo: test for this query parameter
todo: also implement these checks in forum search: similar bug where someone tried to pass in a null to the forum name: https://logserver.mtg.upf.edu/organizations/sentry/issues/3817/?alert_rule_id=32&alert_type=issue&notification_uuid=ef3b6713-2c47-4c11-ba86-17d8fb3e76b5&project=3&referrer=slack