Import Scan fails without 'file' parameter since version 2.41.0

[thedoom13]

This PR has removed the default value of the file parameter.
So when importing a scan without providing file parameter (using the api_scan_configuration), the process fails with
the following error:

ERROR [dojo.api_v2.exception_handler:48] 'file'
Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/rest_framework/mixins.py", line 19, in create
self.perform_create(serializer)
File "/app/dojo/api_v2/views.py", line 2517, in perform_create
serializer.save(push_to_jira=push_to_jira)
File "/app/dojo/api_v2/serializers.py", line 2406, in save
context = self.set_context(data)
^^^^^^^^^^^^^^^^^^^^^^
File "/app/dojo/api_v2/serializers.py", line 2375, in set_context
context = self.setup_common_context(data)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/app/dojo/api_v2/serializers.py", line 2289, in setup_common_context
context["scan"] = data.pop("file")
^^^^^^^^^^^^^^^^
KeyError: 'file'

Steps to Reproduce:

• Call the API /api/v2/import-scan to import a scan without including file parameter.
• The API returns with status 500.

Expected Behavior:

The file parameter is optional, so the API should handle cases where it is not provided gracefully.

Actual Behavior:

The API throws a KeyError when the file parameter is missing.

Additional Context:

• This behavior started in version 2.41.0.
• It was working correctly in previous versions where the file parameter had a default:

  django-DefectDojo/dojo/api_v2/serializers.py

  Line 2206 in 6d847ab

  context["scan"] = data.pop("file", None)