[ENH] add preproc workflow for anat with several sessions

[Remi-Gau]

No description provided.

[sourcery-ai]

PR Type: Enhancement

PR Summary: The pull request introduces an enhancement to the preprocessing workflow for anatomical images with several sessions. It includes updates to the Makefile for data retrieval from OpenNeuro datasets and modifications to a Python script for creating dummy datasets to accommodate multiple sessions.

Decision: Comment

📝 Type: 'Enhancement' - not supported yet.

• Sourcery currently only approves 'Typo fix' PRs.

✅ Issue addressed: this change correctly addresses the issue or implements the desired feature.

No details provided.

📝 Complexity: the changes are too large or complex for Sourcery to approve.

• Unsupported files: the diff contains files that Sourcery does not currently support during reviews.

General suggestions:

• Ensure that the increase in parallelism for data retrieval commands is well-tested on the target hardware to prevent potential performance bottlenecks.
• Consider removing or documenting the commented-out lines for 'func' and 'fmap' data retrieval to maintain code clarity and avoid confusion.
• Verify that the changes made are consistent with the intended use cases and that they do not introduce any unintended side effects.

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[Remi-Gau]

probably worth considering a separate workflow to process anat separately.