maven lister generated an invalid origin URLs for the CVS loader

https://sentry.softwareheritage.org/organizations/swh/issues/104630/?referrer=phabricator_plugin

NotFound: Username is required for a pserver connection: pserver://user:password@cvs.example.com/cvsroot/repository
(6 additional frame(s) were not displayed)
...
  File "__init__.py", line 193, in reraise
    raise self.last_attempt.result()
  File "concurrent/futures/_base.py", line 439, in result
    return self.__get_result()
  File "concurrent/futures/_base.py", line 391, in __get_result
    raise self._exception
  File "__init__.py", line 407, in __call__
    result = fn(*args, **kwargs)
  File "swh/loader/cvs/cvsclient.py", line 128, in connect_pserver
    raise NotFound(

Loading failure, updating to `not_found` status

This happens in a loader task with these arguments:

{args: [], kwargs: {lister_instance_name: repo1.maven.org, lister_name: maven, url: pserver:anonymous@patterntesting.cvs.sourceforge.net:/cvsroot/patterntesting:PatternTesting10/patterntesting-libs}, task_name: swh.loader.cvs.tasks.LoadCvsRepository}

---

Migrated from T4570 (view on Phabricator)