chore(cubesql): Clean up unreferenced insta snapshots #19596

Job	Run time
latest-tag-sha	24s
unit (20.x, 3.11)	13m 17s
build	8m 27s
unit (22.x, 3.11)	13m 8s
lint	4m 44s
build-cubestore	4m 19s
Build & Test :dev for Debian without pushing	28m 20s
integration-cubestore (20.x)	9m 30s
integration-smoke (20.x, 3.11)	23m 36s
docker-image-latest-set-tag	6s
integration (20.x, clickhouse)	5m 3s
integration (20.x, druid)	4m 39s
integration (20.x, elasticsearch)	4m 13s
integration (20.x, mssql)	4m 18s
integration (20.x, mysql)	5m 6s
integration (20.x, postgres)	4m 20s
integration (20.x, prestodb)	4m 14s
integration (20.x, mysql-aurora-serverless)	4m 9s
integration (20.x, crate)	3m 37s
integration (20.x, mongobi)	3m 52s
integration (20.x, firebolt)	4m 4s
integration (20.x, dremio)	5m 8s
integration (20.x, vertica)	4m 8s
	2h 42m 42s

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