/decide endpoint failure due to test tokens

[sentry-io]

Sentry Issue: POSTHOG-2V8

AttributeError: 'NoneType' object has no attribute 'startswith'
(1 additional frame(s) were not displayed)
...
  File "django/core/handlers/base.py", line 181, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "newrelic/hooks/framework_django.py", line 563, in wrapper
    return wrapped(*args, **kwargs)
  File "django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "posthog/api/decide.py", line 92, in get_decide
    token, is_test_environment = _clean_token(token)
  File "posthog/api/capture.py", line 103, in _clean_token
    is_test_environment = token.startswith("test_")

[macobo]

cc @buwilliams this seems to be caused by a recent change to accept test tokens. Given this affects /decide endpoint, errors here could lead to data not being captured -> worth prioritizing!

[macobo]

Bump - this is leading to data loss, worth taking a look at ASAP