make sure directory exists in service project lock

[sentry-dev-app]

Sentry Issue: RENKU-PYTHON-WM

FileNotFoundError: [Errno 2] No such file or directory: '/svc/cache/projects/Y3JhbWFrcmlldGh6LmNo/cramakri/a-2549-test-1.lock'
(11 additional frame(s) were not displayed)
...
  File "renku/ui/service/controllers/api/mixins.py", line 225, in execute_op
    self.reset_local_repo(project)
  File "renku/ui/service/controllers/api/mixins.py", line 248, in reset_local_repo
    with lock:
  File "portalocker/utils.py", line 157, in __enter__
    return self.acquire()
  File "portalocker/utils.py", line 239, in acquire
    fh = self._get_fh()
  File "portalocker/utils.py", line 289, in _get_fh
    return open(self.filename, self.mode, **self.file_open_kwargs)

ProgramInternalError:

we should make the core service more resilient to the project directory being missing when a request comes in. Like checking it exists and otherwise recloning.