get_async_stack_trace is missing part of the graph

[pablogsal]

Bug report

Bug description:

In Modules/_remote_debugging_module.c the get_async_stack_trace is missing part of the graph because it doesn't properly recurse over all tasks.

CPython versions tested on:

3.14, 3.15

Operating systems tested on:

Linux

Linked PRs

• gh-136476: Show the full stack in get_async_stack_trace in _remote_debugging #136483
• [3.14] gh-136476: Show the full stack in get_async_stack_trace in _remote_debugging (GH-136483) #136490
• gh-136476: Remove creation of unused list #136494
• [3.14] gh-136476: Remove creation of unused list (GH-136494) #136495