[3.14] gh-151428: Remove unused imports in idlelib.idle_test (GH-151478) (GH-152916)

[miss-islington]

(cherry picked from commit 984ebbf)

Co-authored-by: Terry Jan Reedy tjreedy@udel.edu

• Issue: Remove unused imports (June 2026) #151428

[terryjreedy]

@serhiy-storchaka This 3.14 (only) backport of a trivial IDLE change has an unrelated test_tkinter failure.
macOS / build and test (macos-15-intel)
2026-07-02T21:17:33.0812420Z ======================================================================
2026-07-02T21:17:33.0814540Z �[31mFAIL�[0m�[1;31m: test_boundary_values_accepted (test.test_tkinter.test_simpledialog.QueryDialogTest.test_boundary_values_accepted)�[0m
2026-07-02T21:17:33.0816210Z ----------------------------------------------------------------------
2026-07-02T21:17:33.0816980Z Traceback (most recent call last):
2026-07-02T21:17:33.0818680Z File �[35m"/Users/runner/work/cpython/cpython/Lib/test/test_tkinter/test_simpledialog.py"�[0m, line �[35m244�[0m, in �[35mtest_boundary_values_accepted�[0m
2026-07-02T21:17:33.0820420Z �[31mself.assertEqual�[0m�[1;31m(d.result, 10)�[0m
2026-07-02T21:17:33.0821200Z �[31m~~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^^^^^^^^�[0m
2026-07-02T21:17:33.0821950Z �[1;35mAssertionError�[0m: �[35mNone != 10�[0m
2026-07-02T21:17:33.0822410Z
2026-07-02T21:17:33.0823790Z ======================================================================
2026-07-02T21:17:33.0825720Z �[31mFAIL�[0m�[1;31m: test_return_no_default (test.test_tkinter.test_simpledialog.SimpleDialogTest.test_return_no_default)�[0m
2026-07-02T21:17:33.0827240Z ----------------------------------------------------------------------
2026-07-02T21:17:33.0828240Z Traceback (most recent call last):
2026-07-02T21:17:33.0830340Z File �[35m"/Users/runner/work/cpython/cpython/Lib/test/test_tkinter/test_simpledialog.py"�[0m, line �[35m68�[0m, in �[35mtest_return_no_default�[0m
2026-07-02T21:17:33.0833220Z �[31mself.assertTrue�[0m�[1;31m(bells)�[0m # rang the bell
2026-07-02T21:17:33.0834560Z �[31m~~~~~~~~~~~~~~~�[0m�[1;31m^^^^^^^�[0m
2026-07-02T21:17:33.0835520Z �[1;35mAssertionError�[0m: �[35m[] is not true�[0m

re-running

[terryjreedy]

Rerun passed; possible timing error.