✨ Use a prefixed dir for storing temp files

And mark them for deletion on JVM exit.

backend/test/backend_tests/rpc_comment_test.clj

@@ -17,7 +17,7 @@
    [app.util.time :as dt]
    [backend-tests.helpers :as th]
    [clojure.test :as t]
-   [datoteka.core :as fs]
+   [datoteka.fs :as fs]
    [mockery.core :refer [with-mocks]]))
 
 (t/use-fixtures :once th/state-init)