chore: expose parallel processing option

[wochinge]

Related Issues

• fixes #issue-number

Proposed Changes?

• expose flag from https://github.com/deepset-ai/haystack-hub-api/pull/4638

How did you test it?

Notes for the reviewer

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Checklist

• I have updated the referenced issue with new insights and changes
• If this is a code change, I have added unit tests
• I've used the conventional commit specification for my PR title
• I updated the docstrings
• If this is a code change, I added meaningful logs and prepared Datadog visualizations and alerts

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
deepset_cloud_sdk/_api
upload_sessions.py
deepset_cloud_sdk/_service
files_service.py
Project Total

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