Automate setting 'Synapse-Indexed' for new indexed externally-hosted datasets

[aclayton555]

Emerges from: https://sagebionetworks.slack.com/archives/C02LPNCD1LL/p1780972873321129

Per Aditya: At this point we still have to manually set the GEO datasets indexed on Synapse to Synapse Indexed

Can we explore ways to automate this as we scale generating Synapse-indexed, Geo hosted datasets (via #228 )

[aclayton555]

2026-07-01: @aditya-nath-sage will work on this and review with @Bankso . Part of ongoing efforts to streamline procedures to generate datasets and related croissant metadata - including generation of master dataset collection for MC2