Delete tkinter._ExceptionReportingCallback (#10689)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

test_cases/stdlib/check_tkinter.py

@@ -0,0 +1,14 @@
+from __future__ import annotations
+
+import tkinter
+import traceback
+import types
+
+
+def custom_handler(exc: type[BaseException], val: BaseException, tb: types.TracebackType | None) -> None:
+    print("oh no")
+
+
+root = tkinter.Tk()
+root.report_callback_exception = traceback.print_exception
+root.report_callback_exception = custom_handler