Do better validation on file payloads

[sentry]

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IntegrityError: new row for relation "contentcuration_file" violates check constraint "file_media_duration_int"

Sentry Issue: STUDIO-HRQ

CheckViolation: new row for relation "contentcuration_file" violates check constraint "file_media_duration_int"
DETAIL:  Failing row contains (db898e1b5381437fbc8f7d242d606983, 0b57166c9f549fbf4cadd6828d36ecb4, 1574207, storage/0/b/0b57166c9f549fbf4cadd6828d36ecb4.mp3, TLL_Leson 7.2_Mwayen-transpò_Odyo.mp3, 3e164cbf3dac4734898567d7d45dca64, mp3, null, document_thumbnail, null, null, 19, null, 2025-04-24 19:40:57.777972+00, 393).

  File "django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "django_prometheus/db/common.py", line 69, in execute
    return super().execute(*args, **kwargs)

IntegrityError: new row for relation "contentcuration_file" violates check constraint "file_media_duration_int"
DETAIL:  Failing row contains (db898e1b5381437fbc8f7d242d606983, 0b57166c9f549fbf4cadd6828d36ecb4, 1574207, storage/0/b/0b57166c9f549fbf4cadd6828d36ecb4.mp3, TLL_Leson 7.2_Mwayen-transpò_Odyo.mp3, 3e164cbf3dac4734898567d7d45dca64, mp3, null, document_thumbnail, null, null, 19, null, 2025-04-24 19:40:57.777972+00, 393).

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  File "contentcuration/views/internal.py", line 299, in api_add_nodes_to_tree
    "root_ids": convert_data_to_nodes(request.user, content_data, parent_id)
  File "contentcuration/views/internal.py", line 665, in convert_data_to_nodes
    map_files_to_node(user, new_node, node_data["files"])
  File "contentcuration/utils/nodes.py", line 92, in map_files_to_node
    resource_obj.save()
  File "contentcuration/models.py", line 2393, in save
    super(File, self).save(*args, **kwargs)