bug: FS cache cleaner goroutine leaks when CleanStop is nil (default) ( 2218), 2247 ( 2271)

bug: FS cache cleaner goroutine leaks when CleanStop is nil (default) ( 2218), 2247 ( 2271): a task in repo2rlenv-commit-runtime-v2 (Harbor dataset). Title: FS cache cleaner goroutine leaks when CleanStop channel is not set