test: Move event loop creation to network thread

This should fix https://github.com/bitcoin/bitcoin/issues/34367

I am not familiar with Windows sockets thread-safety, but creating the
event loop on the main thread, and running it in the network thread
could lead to a fast abort in Python on Windows (without any stderr):

```
77/276 - wallet_txn_clone.py failed, Duration: 1 s

stdout:
2025-12-10T08:04:27.500134Z TestFramework (INFO): PRNG seed is: 4018092284830106117

stderr:

Combine the logs and print the last 99999999 lines ...
============
Combined log for D:\a\_temp/test_runner_₿_🏃_20251210_075632/wallet_txn_clone_196:
============
 test  2025-12-10T08:04:27.500134Z TestFramework (INFO): PRNG seed is: 4018092284830106117
 test  2025-12-10T08:04:27.500433Z TestFramework (DEBUG): Setting up network thread
```

Also, I couldn't find any docs that require the loop must be created on
the thread that runs them:

* https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.new_event_loop
* https://docs.python.org/3/library/asyncio-eventloop.html#asyncio.loop.run_forever

However, the patch seems trivial to review, harmless, and easy to
revert, so it may be a good try to fix the intermittent Windows Python
crash.

Github-Pull: #34820
Rebased-From: fa050da980

test/functional/test_framework/p2p.py

@@ -740,10 +740,10 @@ class NetworkThread(threading.Thread):
 
         NetworkThread.listeners = {}
         NetworkThread.protos = {}
-        NetworkThread.network_event_loop = asyncio.SelectorEventLoop() if platform.system() == "Windows" else asyncio.new_event_loop()
 
     def run(self):
         """Start the network thread."""
+        NetworkThread.network_event_loop = asyncio.SelectorEventLoop() if platform.system() == "Windows" else asyncio.new_event_loop()
         self.network_event_loop.run_forever()
 
     def close(self, *, timeout):

test/functional/test_framework/test_framework.py

@@ -260,7 +260,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
         self.log.debug('Setting up network thread')
         self.network_thread = NetworkThread()
         self.network_thread.start()
-        self.wait_until(lambda: self.network_thread.network_event_loop.is_running())
+        self.wait_until(lambda: self.network_thread.network_event_loop is not None and self.network_thread.network_event_loop.is_running())
 
         if self.options.usecli:
             if not self.supports_cli: