Test cleanup should use the same pool & connection options as the test itself and not DATABASE_URL unconditionally

[poliorcetics]

sqlx/sqlx-core/src/testing/mod.rs

Line 220 in 0449ac5

if let Err(e) = DB::cleanup_test(&test_context.db_name).await {

This prevents testing with a local PostgreSQL Unix-domain socket for example

[poliorcetics]

Workaround found at #1202 (comment)

[poliorcetics]

Reopening because I think it makes sense to fix the issue even if there is a workaround

[abonander]

Test cleanup literally deletes the database. It can't use anything else.