test(cubesql): Extract some join tests to separate module #2405

Job	Run time
latest-tag-sha	19s
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	2m 15s
build	6m 0s
tests (20.x, athena-export-bucket-s3)	13m 3s
tests (20.x, bigquery-export-bucket-gcs)	12m 17s
tests (20.x, clickhouse)	5m 8s
tests (20.x, clickhouse-export-bucket-s3)	5m 13s
tests (20.x, databricks-jdbc)	5m 51s
tests (20.x, databricks-jdbc-export-bucket-s3)	5m 59s
tests (20.x, databricks-jdbc-export-bucket-azure)	6m 56s
tests (20.x, mssql)	4m 56s
tests (20.x, mysql)	4m 55s
tests (20.x, postgres)	4m 26s
tests (20.x, snowflake)	5m 4s
tests (20.x, snowflake-export-bucket-s3)	5m 8s
tests (20.x, snowflake-export-bucket-azure)	4m 53s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	5m 12s
tests (20.x, snowflake-export-bucket-gcs)	4m 59s
	1h 42m 34s

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