Restoring task's backup which initially was created from file share fails

[klakhov]

Actions before raising this issue

• [X] I searched the existing issues and did not find anything similar.
• [X] I read/searched the docs

Steps to Reproduce

During development of #8287 the problem occured:

1. Connect file share to CVAT
2. Create a task with files from share
3. Add some annotations
4. Backup the task
5. Try to restore it, the error occurs:

Expected Behavior

Backup should be restored successfully

Possible Solution

It seems backup of the task which is created from local files and file share have different folder structure. Maybe this is the problem. Backup with task from share looks like this:

Backup with task from local files looks like:

Context

No response

Environment

• Git commit ff50b464ddaa85a2496da79ac87fa71455f01c92
• Env: local
• Full error log:

[2024-08-13 08:10:57,951] ERROR rq.worker: [Job import:task-02f399a3-612d-4bd8-b1fb-9ed57c83c2e9-backup]: exception raised while executing (cvat.apps.engine.utils.import_resource_with_clean_up_after)
Traceback (most recent call last):
  File "/home/kirill/projects/cvat/.env/lib/python3.10/site-packages/rq/worker.py", line 1431, in perform_job
    rv = job.perform()
  File "/home/kirill/projects/cvat/.env/lib/python3.10/site-packages/rq/job.py", line 1280, in perform
    self._result = self._execute()
  File "/home/kirill/projects/cvat/.env/lib/python3.10/site-packages/rq/job.py", line 1317, in _execute
    result = self.func(*self.args, **self.kwargs)
  File "/home/kirill/projects/cvat/cvat/apps/engine/utils.py", line 289, in import_resource_with_clean_up_after
    result = func(filename, *args, **kwargs)
  File "/usr/lib/python3.10/contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "/home/kirill/projects/cvat/cvat/apps/engine/backup.py", line 751, in _import_task
    db_task = task_importer.import_task()
  File "/home/kirill/projects/cvat/cvat/apps/engine/backup.py", line 742, in import_task
    self._import_task()
  File "/home/kirill/projects/cvat/cvat/apps/engine/backup.py", line 690, in _import_task
    _create_thread(self._db_task.pk, data.copy(), isBackupRestore=True)
  File "/usr/lib/python3.10/contextlib.py", line 79, in inner
    return func(*args, **kwds)
  File "/home/kirill/projects/cvat/cvat/apps/engine/task.py", line 553, in _create_thread
    manifest_file = _validate_manifest(
  File "/home/kirill/projects/cvat/cvat/apps/engine/task.py", line 342, in _validate_manifest
    if is_manifest(full_manifest_path):
  File "/home/kirill/projects/cvat/utils/dataset_manifest/core.py", line 819, in is_manifest
    return is_video_manifest(full_manifest_path) or \
  File "/home/kirill/projects/cvat/utils/dataset_manifest/core.py", line 824, in is_video_manifest
    return validator.validate()
  File "/home/kirill/projects/cvat/utils/dataset_manifest/core.py", line 737, in validate
    with open(self._manifest.path, 'r') as manifest:
FileNotFoundError: [Errno 2] No such file or directory: '/home/kirill/projects/cvat/share/manifest.jsonl'