Python implementation of traceback limit does not default to 1000 as documented in 3.13

Bug report

Bug description:

According to the documentation of sys.tracebacklimit, it should default to 1000 if not set, so the following snippet:

import sys

def f():
    f()

sys.setrecursionlimit(2000)
f()

produces a traceback of 1000 frames as expected in 3.12:

Traceback (most recent call last):
  File "t.py", line 4, in f
    f()
    ~^^
  File "t.py", line 4, in f
    f()
    ~^^
  File "t.py", line 4, in f
    f()
    ~^^
  [Previous line repeated 997 more times]
RecursionError: maximum recursion depth exceeded

But in 3.13 and the current master, it produces a traceback of all 2000 frames:

Traceback (most recent call last):
  File "t.py", line 4, in f
    f()
    ~^^
  File "t.py", line 4, in f
    f()
    ~^^
  File "t.py", line 4, in f
    f()
    ~^^
  File "t.py", line 4, in f
    f()
    ~^^
  [Previous line repeated 1996 more times]
RecursionError: maximum recursion depth exceeded

This is because with issue #110721, traceback is now printed with the traceback module by default, and the traceback module defaults sys.tracebacklimit to None when not set:
https://github.com/python/cpython/blob/c3ed775899eedd47d37f8f1840345b108920e400/Lib/traceback.py#L458

whereas the C implementation of the traceback printer has a proper default of 1000 for sys.tracebacklimit as documented:
https://github.com/python/cpython/blob/c3ed775899eedd47d37f8f1840345b108920e400/Python/traceback.c#L707

I will submit a PR to make 1000 the default value for sys.tracebacklimit in the Python implementation of the traceback module.

CPython versions tested on:

3.13, CPython main branch

Operating systems tested on:

Linux, Windows

Linked PRs

• gh-125719
• gh-125777

Bắt đầu trong Lib/traceback.py, tại phần xử lý mặc định cho sys.tracebacklimit, và so sánh với phần triển khai bằng C trong Python/traceback.c. Xác minh giá trị mặc định được ghi trong tài liệu là 1000 bằng cách sử dụng ví dụ đệ quy từ issue, đảm bảo rằng trình in traceback của Python giới hạn đầu ra nhất quán với phần triển khai bằng C.