feat: add --environment flag to sqlmesh janitor for scoped cleanup #3687

Job	Run time
changes	8s
test-dbt-versions (1.9)	1m 42s
test-dbt-versions (1.5)	1m 44s
test-dbt-versions (1.7)	1m 44s
test-dbt-versions (1.10)	1m 46s
test-dbt-versions (1.4)	1m 30s
test-dbt-versions (1.6)	1m 37s
test-dbt-versions (1.3)	1m 38s
test-dbt-versions (1.8)	1m 36s
test-vscode-e2e	-1s
test-vscode	-1s
migration-test	1m 31s
doc-tests	29s
cicd-tests-windows	10m 8s
style-and-cicd-tests (3.9)	2m 57s
style-and-cicd-tests (3.12)	3m 8s
style-and-cicd-tests (3.10)	3m 10s
style-and-cicd-tests (3.13)	3m 13s
engine-tests-docker (risingwave)	2m 59s
engine-tests-docker (mssql)	1m 42s
style-and-cicd-tests (3.11)	2m 32s
engine-tests-docker (duckdb)	1m 27s
engine-tests-docker (spark)	5m 22s
engine-tests-docker (trino)	8m 36s
engine-tests-docker (postgres)	2m 32s
engine-tests-docker (mysql)	1m 36s
engine-tests-docker (clickhouse)	2m 31s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	1h 7m 16s

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