fix: health score retention

[gaspergrom]

Note

Medium Risk
Changes the filtering logic used to compute health score retention, which can materially alter retention metrics and downstream health scores. Low implementation risk, but impacts analytics outputs used for product/business decisions.

Overview
Fixes health score retention calculations by additionally filtering both current- and previous-quarter member cohorts to only include activities whose (type, platform) appears in activityTypes_filtered.

This aligns retention with the same activity-type/platform inclusion rules used elsewhere, potentially changing computed retention rates and benchmarks for affected segments.

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[Copilot]

Pull request overview

Updates the Tinybird retention health-score computation to only consider activities whose (type, platform) pairs are allowed by activityTypes_filtered, bringing retention in line with other activity-filtered health score metrics.

Changes:

• Added (type, platform) IN (SELECT activityType, platform FROM activityTypes_filtered) filtering to the current quarter cohort query.
• Added the same filtering to the previous quarter cohort query.
• Applied the filtering consistently in both the project-scoped datasource branch and the *_bucket_union branch.

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