feat(janitor): add scoped snapshot cleanup for invalidated environments #3954

Job	Run time
changes	5s
test-dbt-versions (1.9)	1m 42s
test-dbt-versions (1.7)	1m 51s
test-dbt-versions (1.10)	1m 43s
test-dbt-versions (1.6)	1m 34s
test-dbt-versions (1.8)	1m 38s
test-dbt-versions (1.3)	1m 46s
test-dbt-versions (1.5)	1m 28s
test-dbt-versions (1.4)	1m 24s
test-vscode-e2e	0s
test-vscode	0s
doc-tests	38s
migration-test	1m 16s
cicd-tests-windows	10m 59s
style-and-cicd-tests (3.13)	22m 39s
style-and-cicd-tests (3.10)	23m 19s
style-and-cicd-tests (3.9)	23m 0s
style-and-cicd-tests (3.11)	25m 21s
style-and-cicd-tests (3.12)	23m 32s
engine-tests-docker (spark)	5m 23s
engine-tests-docker (trino)	8m 9s
engine-tests-docker (mysql)	1m 48s
engine-tests-docker (starrocks)	3m 17s
engine-tests-docker (duckdb)	1m 40s
engine-tests-docker (postgres)	2m 48s
engine-tests-docker (risingwave)	2m 49s
engine-tests-docker (clickhouse)	2m 59s
engine-tests-docker (mssql)	1m 51s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	2h 54m 39s

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