Use Current ioloop in SyncWrapper

[frebib]

What does this PR do?

A new ioloop is created for each SyncWrapper, but is not swapped in automatically (see make_current=False for Tornado) anymore - this means that the context manager (current_ioloop) is needed to access that ioloop for the purposes of the synchronus execution.

This also needs to be backported to 3007.x (3007.2)

What issues does this PR fix or reference?

Fixes #66775

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

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[frebib]

We hit this issue in a slightly different manner to the linked bug ticket, but it's the same problem

[ERROR   ] Rendering exception occurred
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/salt/utils/templates.py", line 471, in render_jinja_tmpl
    output = template.render(**decoded_context)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 1301, in render
    self.environment.handle_exception()
  File "/usr/lib/python3/dist-packages/jinja2/environment.py", line 936, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "<template>", line 1, in top-level template code
  File "/usr/lib/python3/dist-packages/salt/utils/jinja.py", line 162, in get_source
    self.check_cache(_template)
  File "/usr/lib/python3/dist-packages/salt/utils/jinja.py", line 116, in check_cache
    ret = self.cache_file(template)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/utils/jinja.py", line 108, in cache_file
    fcl = self.file_client()
          ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/utils/jinja.py", line 97, in file_client
    self._file_client = salt.fileclient.get_file_client(
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/fileclient.py", line 56, in get_file_client
    return {"remote": RemoteClient, "local": FSClient, "pillar": PillarClient}.get(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/fileclient.py", line 1130, in __init__
    self.channel = salt.channel.client.ReqChannel.factory(self.opts)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/channel/client.py", line 56, in factory
    return SyncWrapper(
           ^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/utils/asynchronous.py", line 76, in __init__
    self.obj = cls(*args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/channel/client.py", line 133, in factory
    auth = salt.crypt.AsyncAuth(opts, io_loop=io_loop)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/salt/crypt.py", line 697, in __new__
    auth.__singleton_init__(opts, io_loop=io_loop)
  File "/usr/lib/python3/dist-packages/salt/crypt.py", line 744, in __singleton_init__
    self._authenticate_future = tornado.concurrent.Future()
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/asyncio/events.py", line 677, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'MainThread'.