Revert "monitor: use aio_co_reschedule_self()"

Merge Request Required Information

Summary of Changes

Fix the AioContext switch for coroutine-based QMP commands. This fixes crashes with block_resize on images using aio=native or aio=io_uring.

Approved Development Ticket

Jira: https://issues.redhat.com/browse/RHEL-38697

Jira: https://issues.redhat.com/browse/RHEL-34618