feat(janitor): add scoped snapshot cleanup for invalidated environments #4050

Job	Run time
changes	7s
test-dbt-versions (1.8)	1m 43s
test-dbt-versions (1.4)	1m 30s
test-dbt-versions (1.6)	1m 42s
test-dbt-versions (1.5)	1m 37s
test-dbt-versions (1.3)	1m 45s
test-dbt-versions (1.7)	1m 41s
test-dbt-versions (1.10)	1m 52s
test-dbt-versions (1.9)	1m 47s
test-vscode-e2e	0s
test-vscode	0s
doc-tests	32s
migration-test	1m 31s
cicd-tests-windows	1m 57s
style-and-cicd-tests (3.13)	1m 54s
style-and-cicd-tests (3.9)	13s
style-and-cicd-tests (3.10)	1m 59s
style-and-cicd-tests (3.12)	1m 55s
engine-tests-docker (postgres)	1m 54s
style-and-cicd-tests (3.11)	1m 16s
engine-tests-docker (spark)	1m 59s
engine-tests-docker (mysql)	28s
engine-tests-docker (starrocks)	2m 0s
engine-tests-docker (clickhouse)	2m 1s
engine-tests-docker (trino)	2m 0s
engine-tests-docker (risingwave)	1m 59s
engine-tests-docker (mssql)	8s
engine-tests-docker (duckdb)	13s
ui-style	-1s
ui-test	-1s
engine-tests-cloud	1s
	37m 42s

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