Query suggestions for `GroupByMetrics` #3142

Job	Run time
MetricFlow Tests (PostgreSQL)	3m 19s
MetricFlow Tests (DuckDB) (3.8)	4m 0s
MetricFlow Packages Tests (3.8)	41s
MetricFlow Tests (DuckDB) (3.11)	3m 14s
MetricFlow Packages Tests (3.11)	38s
MetricFlow Unit Tests	1s
	11m 53s

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