pytest: Remove tests that rely on presplit behavior

These tests make assumptions about the presplitter behavior which
we'll remove in the next commit. We remove them here so we don't cause
temporary breaks in the git history.

tests/test_plugin.py

@@ -2133,43 +2133,6 @@ def test_coin_movement_notices(node_factory, bitcoind, chainparams):
     check_coin_moves(l2, chanid_3, l2_l3_mvts, chainparams)
 
 
-def test_3847_repro(node_factory, bitcoind):
-    """Reproduces the issue in #3847: duplicate response from plugin
-
-    l2 holds on to HTLCs until the deadline expires. Then we allow them
-    through and either should terminate the payment attempt, and the second
-    would return a redundant result.
-
-    """
-    l1, l2, l3 = node_factory.line_graph(3, opts=[
-        {},
-        {},
-        {
-            'plugin': os.path.join(os.getcwd(), 'tests/plugins/hold_htlcs.py'),
-            'hold-time': 11,
-            'hold-result': 'fail',
-        },
-    ], wait_for_announce=True)
-    wait_for(lambda: len(l1.rpc.listchannels()['channels']) == 4)
-
-    # Amount sufficient to trigger the presplit modifier
-    amt = 20 * 1000 * 1000
-
-    i1 = l3.rpc.invoice(
-        amount_msat=amt, label="direct", description="desc"
-    )['bolt11']
-    with pytest.raises(RpcError):
-        l1.rpc.pay(i1, retry_for=10)
-
-    # We wait for at least two parts, and the bug would cause the `pay` plugin
-    # to crash
-    l1.daemon.wait_for_logs([r'Payment deadline expired, not retrying'] * 2)
-
-    # This call to paystatus would fail if the pay plugin crashed (it's
-    # provided by the plugin)
-    l1.rpc.paystatus(i1)
-
-
 def test_important_plugin(node_factory):
     # Cache it here.
     pluginsdir = os.path.join(os.path.dirname(__file__), "plugins")