Improve synthetic with + in task label for `beh/` data#481

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yarikoptic wants to merge 2 commits intobids-standard:masterfrom yarikoptic:enh-plus

+21-5

Commits on Feb 5, 2025

Adjust create_synthethic_ds.sh to use 2 tasknames with +
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[DATALAD RUNCMD] Recreate beh/ portion of synthetic dataset with new tasks
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