Test: Add dataset cache to BigQuery connector#14812
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When caseInsensitiveNameMatching=true, the BigQueryClient makes a call to listDatasets for each call on toRemoteDataset. This is problematic when running queries like SHOW SCHEMAS since listDatasets is called once to get the initial list, then once again for each schema. This is expensive if the BigQuery project has a large number of datasets. This commit adds a cache to listing datasets to drastically reduce the query time for SHOW SCHEMAS.
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Run tests with secret #14729