feat: add --environment flag to sqlmesh janitor for scoped cleanup #3668

Job	Run time
changes	8s
test-dbt-versions (1.5)	1m 28s
test-dbt-versions (1.4)	1m 30s
test-dbt-versions (1.3)	1m 43s
test-dbt-versions (1.6)	1m 47s
test-dbt-versions (1.7)	1m 45s
test-dbt-versions (1.10)	1m 43s
test-dbt-versions (1.9)	1m 48s
test-dbt-versions (1.8)	1m 42s
test-vscode-e2e	-1s
test-vscode	-1s
migration-test	1m 27s
doc-tests	37s
cicd-tests-windows	9m 47s
style-and-cicd-tests (3.13)	3m 11s
style-and-cicd-tests (3.10)	24m 18s
style-and-cicd-tests (3.9)	22m 48s
engine-tests-docker (duckdb)	1m 28s
engine-tests-docker (postgres)	2m 16s
engine-tests-docker (mysql)	1m 38s
engine-tests-docker (mssql)	2m 1s
style-and-cicd-tests (3.11)	2m 52s
style-and-cicd-tests (3.12)	3m 20s
engine-tests-docker (trino)	8m 3s
engine-tests-docker (spark)	5m 53s
engine-tests-docker (clickhouse)	2m 40s
engine-tests-docker (risingwave)	2m 43s
ui-test	0s
ui-style	-1s
engine-tests-cloud	0s
	1h 48m 33s

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