[3.12] IDLE: Fix test_debugger bug and buildbot failures (GH-112258) (#112259)

[3.12] IDLE: Fix test_debugger bug and buildbot failures (GH-112258) (#112259)

IDLE: Fix test_debugger bug and buildbot failures (GH-112258)

Missing "requires('gui')" causes Tk() to fail when no gui.
This caused CI Hypothesis test to fail, but I did not understand
the its error message. Then buildbots failed.

IdbTest failed on draft Bdb replacement because so different.
Simplified version works on old and new.
(cherry picked from commit 14fd86a59d0d91fe72641efeb14a59d99127dec3)

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