test: add functional test for IBD stalling logic

test/functional/test_runner.py

@@ -242,6 +242,7 @@ BASE_SCRIPTS = [
     'wallet_importprunedfunds.py --descriptors',
     'p2p_leak_tx.py',
     'p2p_eviction.py',
+    'p2p_ibd_stalling.py',
     'wallet_signmessagewithaddress.py',
     'rpc_signmessagewithprivkey.py',
     'rpc_generate.py',