Fix import of pre-2.11 workflows into 2.11

[tcompa]

Observed error (through fractal-client 2.7.0a0):

ERROR:root:Server returned 422

ERROR:root:Original request: POST http://localhost:8000/api/v2/project/1/workflow/import/

ERROR:root:Original payload: {"name": "wf-1738071424-1", "task_list": [{"meta_non_parallel": {"cpus_per_task": 1, "mem": 500}, "meta_parallel": {"cpus_per_task": 1, "mem": 500}, "args_non_parallel": {"image_dirs": ["/data/images/10.5281_zenodo.8287221/"], "allowed_channels": [{"color": "00FFFF", "wavelength_id": "A01_C01", "label": "DAPI", "window": {"start": 110, "end": 800}, "active": true}, {"color": "FF00FF", "wavelength_id": "A01_C02", "label": "nanog", "window": {"start": 110, "end": 290}, "active": true}, {"color": "FFFF00", "wavelength_id": "A02_C03", "label": "Lamin B1", "window": {"start": 110, "end": 1600}, "active": true}], "coarsening_xy": 2, "num_levels": 5, "image_extension": "png", "overwrite": true}, "args_parallel": null, "input_filters": {"attributes": {}, "types": {}}, "task": {"pkg_name": "fractal-tasks-core", "version": "1.4.2", "name": "Convert Cellvoyager to OME-Zarr"}}, {"meta_non_parallel": {"cpus_per_task": 1, "mem": 500}, "meta_parallel": {"cpus_per_task": 1, "mem": 500}, "args_non_parallel": {"overwrite": true}, "args_parallel": null, "input_filters": {"attributes": {}, "types": {}}, "task": {"pkg_name": "fractal-tasks-core", "version": "1.4.2", "name": "Project Image (HCS Plate)"}}]}

ERROR:root:Server error message: {'detail': [{'loc': ['body', 'task_list', 0, 'input_filters'], 'msg': 'extra fields not permitted', 'type': 'value_error.extra'}, {'loc': ['body', 'task_list', 1, 'input_filters'], 'msg': 'extra fields not permitted', 'type': 'value_error.extra'}]}

but this contradicts #2156.

I think we got a typo in this class below (filters->input_filters?)

class WorkflowTaskImportV2(BaseModel, extra=Extra.forbid):

    meta_non_parallel: Optional[dict[str, Any]] = None
    meta_parallel: Optional[dict[str, Any]] = None
    args_non_parallel: Optional[dict[str, Any]] = None
    args_parallel: Optional[dict[str, Any]] = None
    type_filters: Optional[dict[str, bool]] = None
    filters: Optional[dict[str, Any]] = None