Extend scheduler system test to check plan working directory handling

1) Working directories of plans that are no long configured should be
   removed.
2) Already existing plan directories of configured plans should not be
   emptied.

CMK-18459

tests/test_scheduler.rs

@@ -29,7 +29,19 @@ use walkdir::WalkDir;
 #[ignore]
 async fn test_scheduler() -> AnyhowResult<()> {
     let test_dir = Utf8PathBuf::from(var("TEST_DIR")?);
+    let unconfigured_plan_working_dir = test_dir
+        .join("working")
+        .join("plans")
+        .join("should_be_removed_during_scheduler_setup");
+    let configured_plan_previous_execution_dir = test_dir
+        .join("working")
+        .join("plans")
+        .join("rcc_headless")
+        .join("should_still_exist_after_scheduler_run");
     create_dir_all(&test_dir)?;
+    create_dir_all(&unconfigured_plan_working_dir)?;
+    create_dir_all(&configured_plan_previous_execution_dir)?;
+
     #[cfg(windows)]
     let current_user_name = var("UserName")?;
     let config = create_config(
@@ -59,6 +71,8 @@ async fn test_scheduler() -> AnyhowResult<()> {
         &current_user_name,
     )
     .await?;
+    assert!(!unconfigured_plan_working_dir.exists());
+    assert!(configured_plan_previous_execution_dir.is_dir());
     assert_results_directory(&config.results_directory);
     assert_managed_directory(
         &config.managed_directory,