Check for allowed Git forges in Copr can raise CoprNoResultException

[sentry-io]

Sentry Issue: PCKT-002-PACKIT-SERVICE-747

CoprNoResultException: b'Project packit/newa does not exist.'
(13 additional frame(s) were not displayed)
...
  File "packit_service/worker/helpers/build/copr_build.py", line 342, in is_forge_project_allowed_to_build_in_copr
    copr_project = self.api.copr_helper.copr_client.project_proxy.get(
  File "copr/v3/helpers.py", line 73, in wrapper
    result = func(*args, **kwargs)
  File "copr/v3/proxies/project.py", line 34, in get
    response = self.request.send(endpoint=endpoint, params=params)
  File "copr/v3/requests.py", line 46, in send
    handle_errors(response)
  File "copr/v3/requests.py", line 131, in handle_errors
    raise CoprNoResultException(response_json["error"], response=response)