Onboard Pipelines:

1. city_health_dashboard.chdb_data_tract_all
2. city_health_dashboard.chdb_data_city_all

Based on #

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Checklist

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• Please merge this PR for me once it is approved.
• If this PR adds or edits a dataset or pipeline, it was reviewed and approved by the Google Cloud Public Datasets team beforehand.
• If this PR adds or edits a dataset or pipeline, I put all my code inside datasets/city_health_dashboard and nothing outside of that directory.
• This PR is appropriately labeled.