fix(hub): address git persistence review feedback

Author: MioYuuIH

runtime/hub/frontend/apps/spawn/src/components/CourseCard.tsx

@@ -177,7 +177,7 @@ export const CourseCard = memo(function CourseCard({
             <span className="repo-url-hint" aria-label="Git repository hint">
               ?
               <span className="repo-url-tooltip">
-                The repository will be cloned at startup. It is kept after the server stops unless cleanup is selected or enforced by the administrator.
+                The repository will be cloned at startup.
                 {allowedGitProviders.length > 0 && ` Supports: ${allowedGitProviders.join(', ')}.`}
               </span>
             </span>

runtime/hub/tests/test_git_clone_persistence.py

@@ -118,7 +118,6 @@ def test_invalid_repo_persist_submission_falls_back_to_admin_default():
     assert result is False
 
 
-
 def test_persistent_init_container_sets_env_without_cleanup_lifecycle():
     spawner = make_spawner()