feat(janitor): add scoped snapshot cleanup for invalidated environments #3956

Job	Run time
changes	8s
test-dbt-versions (1.3)	1m 46s
test-dbt-versions (1.7)	1m 40s
test-dbt-versions (1.5)	1m 36s
test-dbt-versions (1.8)	1m 44s
test-dbt-versions (1.6)	1m 41s
test-dbt-versions (1.9)	1m 40s
test-dbt-versions (1.10)	1m 45s
test-dbt-versions (1.4)	1m 30s
test-vscode-e2e	0s
test-vscode	-8s
migration-test	1m 28s
cicd-tests-windows	11m 49s
doc-tests	34s
style-and-cicd-tests (3.12)	24m 44s
style-and-cicd-tests (3.13)	22m 47s
style-and-cicd-tests (3.10)	21m 50s
style-and-cicd-tests (3.9)	23m 39s
style-and-cicd-tests (3.11)	19m 7s
engine-tests-docker (trino)	8m 18s
engine-tests-docker (clickhouse)	3m 6s
engine-tests-docker (postgres)	2m 44s
engine-tests-docker (duckdb)	1m 30s
engine-tests-docker (mysql)	1m 36s
engine-tests-docker (mssql)	1m 44s
engine-tests-docker (starrocks)	2m 32s
engine-tests-docker (risingwave)	2m 38s
engine-tests-docker (spark)	5m 37s
ui-style	-1s
ui-test	-1s
engine-tests-cloud	0s
	2h 49m 3s

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