Remove fake clock uninstall test from tic-tac-toe lab

Description

Now that we have after-all hooks available in our test framework, we can remove the fake/placeholder test that was previously needed to handle clock uninstallation in the tic-tac-toe lab challenge.

This cleanup will make the test suite cleaner and more maintainable, allowing the after-all hook to handle teardown gracefully without needing a workaround test.

Acceptance Criteria

• Locate and remove the fake test for uninstalling the clock from the tic-tac-toe lab challenge
• Verify that the after-all hook is properly configured to handle clock cleanup
• Confirm that all remaining tests still pass without the fake test in place
• Test the challenge to ensure the lab functions as expected without any console warnings or errors

Context

File: curriculum/challenges/english/blocks/lab-tic-tac-toe/67e3a6b7f60b4085588189e6.md

The fake test was a necessary workaround before after-all hooks were available. With modern hook support now in place, we can remove this technical debt and simplify the test structure.