Uploaded files are not uploaded to the document service when starting a process from Modeler

[esraagamal6]

Describe the Bug

when we start a process with a form from the Web modeler the files are not uploaded to the document service. Same for play
related to 2409
Steps to Reproduce

1. Create a from with "file picker" field
2. Create a process with userTask and link the form to the start of the process
3. Run the process with uploading the file

Expected Behavior

Metadata is created for the uploaded file

Environment

• OS: [e.g. Windows 7]
• Library version: [e.g. 2.0.0]
• Camunda version: 8.7.0-alpha1