Update CDC500_states query - #2149
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This pull request refactors the SQL query in scripts/us_cdc/cdc500_state/process.py by introducing Common Table Expressions (CTEs) and updating the source table references to spanner_dc_graph_prod_DEFAULT. The review identifies an opportunity to improve query performance by removing a redundant join in the svo_count CTE and recommends using SAFE_DIVIDE to handle potential division-by-zero errors during the percentage calculation.
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PR is for updating query in process.py from using the old resolved StatVarObservation table to the new TimeSeries and Observation schemas tables of latest spanner .