test(logo): fix tests broken by upstream logo.js API changes

- Add synth.transport mock in doStopTurtles suite after upstream added
  transport.isAvailable guard in doStopTurtles
- Replace _totalIterations with _iterationBudget in MAX_ITERATIONS test
  after upstream switched iteration guard to countdown logic

Signed-off-by: Vanshika <pahalvanshikaa@gmail.com>

Author: vanshika2720

js/__tests__/logo.test.js

@@ -2196,7 +2196,8 @@ describe("Logo doStopTurtles timer cleanup", () => {
             stop: jest.fn(),
             stopSound: jest.fn(),
             disposeAllInstruments: jest.fn(),
-            recorder: null
+            recorder: null,
+            transport: { isAvailable: false, cancel: jest.fn() }
         };
         logo._restoreConnections = jest.fn();
     });
@@ -2311,7 +2312,7 @@ describe("Logo runFromBlockNow additional coverage", () => {
     });
 
     test("stops execution and reports error when MAX_ITERATIONS exceeded", () => {
-        logo._totalIterations = logo._MAX_ITERATIONS;
+        logo._iterationBudget = 1; // will decrement to 0 on first runFromBlockNow call
         logo.blockList = [
             {
                 name: "noop",