Fix recursive clean|clobber failures and orphaned build artifacts in Tests/Manual

- Update clean and clobber targets in Tests/Manual/Jakefile to enforce -mindepth 2 -maxdepth 2 traversal. This accurately purges subsidiary Build directories and Frameworks symlinks without triggering subjake dependency cycles.

- Inject explicit clean and clobber overrides into all 150+ subsidiary application Jakefiles. This forces local execution to wipe the top-level Build directory, bypassing applicationtask's default behavior of only targeting configuration-specific intermediate paths.

- Harmonizes artifact sweeping across both root-level orchestration and local leaf-level execution.

Tests/Manual/KeyWindowInTheBackgroundActivation/Jakefile

@@ -170,3 +170,13 @@ function addBundleFileSizes(bundlePath, totalBytes)
             totalBytes.mhtml += filePath.size();
     }
 }
+
+task ("clean", function()
+{
+    cp.execSync("rm -rf Build", { stdio: "inherit" });
+});
+
+task ("clobber", ["clean"], function()
+{
+    cp.execSync("rm -rf Frameworks", { stdio: "inherit" });
+});