fix: mentions snowflake sink

[gaspergrom]

Note

Medium Risk
Changes the Snowflake/Kafka export from full snapshots to a time-windowed incremental sync based on createdAt, which can drop or duplicate data if timestamps or schedules drift. Also extends the exported schema, requiring downstream consumers to handle new columns.

Overview
Updates the mentions Tinybird datasource schema to include authorFollowerCount and tags.

Modifies the octolens_mentions_sink pipe to export these new fields and switches the daily Kafka/Snowflake export from a full snapshot to an incremental pull using a createdAt previous-day window filter.

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