Merge bitcoin/bitcoin#29041: test: fix intermittent error in rpc_net.py (#29030)

ea00f982d2 test: fix intermittent error in rpc_net.py (#29030) (Sebastian Falbesoner)

Pull request description:

  Asserting for the debug log message "Added connection peer=" is insufficient for ensuring that this new connection will show up in a following getpeerinfo() call, as the debug message is written in the CNode ctor, which means it hasn't necessarily been added to CConnman.m_nodes at this point.

  Solve this by using the recently introduced `wait_for_new_peer` helper (see #29006,  commit 00e0658e77), which is more robust.

  Fixes #29030.

ACKs for top commit:
  maflcko:
    lgtm ACK ea00f982d2

Tree-SHA512: dda307949a466fb3b24408a8c213d307e0af2155f2e8b4e52c836a22397f9d218bf9d8c54ca55bae62a96d7566f27167db9311dd8801785c327234783af5ed00

test/functional/rpc_net.py

@@ -111,7 +111,7 @@ class NetTest(BitcoinTestFramework):
         no_version_peer_id = 2
         no_version_peer_conntime = int(time.time())
         self.nodes[0].setmocktime(no_version_peer_conntime)
-        with self.nodes[0].assert_debug_log([f"Added connection peer={no_version_peer_id}"]):
+        with self.nodes[0].wait_for_new_peer():
             no_version_peer = self.nodes[0].add_p2p_connection(P2PInterface(), send_version=False, wait_for_verack=False)
         self.nodes[0].setmocktime(0)
         peer_info = self.nodes[0].getpeerinfo()[no_version_peer_id]