CI: Disable dual-funded tests while they're hanging.

Too many unrelated PRs are blocked.  Disabling these altogether while
we get to the bottom of it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

.github/workflows/ci.yaml

@@ -151,11 +151,6 @@ jobs:
             COMPAT: 0
             TEST_GROUP: 2
             TEST_GROUP_COUNT: 2
-          - CFG: "DUAL_FUND"
-            EXPERIMENTAL_DUAL_FUND: 1
-            DEVELOPER: 1
-            COMPAT: 0
-
           # Various other configurations
           - CFG: "Elements"
             NETWORK: liquid-regtest
@@ -278,19 +273,6 @@ jobs:
             TEST_GROUP: 10
             TEST_GROUP_COUNT: 10
             PYTEST_PAR: 3
-            # Run (some) tests with experimental_dual_fund on
-          - CFG: "valgrind-DUAL_FUND-1"
-            VALGRIND: 1
-            EXPERIMENTAL_DUAL_FUND: 1
-            TEST_GROUP: 1
-            TEST_GROUP_COUNT: 2
-            PYTEST_PAR: 3
-          - CFG: "valgrind-DUAL_FUND-2"
-            VALGRIND: 1
-            EXPERIMENTAL_DUAL_FUND: 1
-            TEST_GROUP: 2
-            TEST_GROUP_COUNT: 2
-            PYTEST_PAR: 3
     steps:
       - name: Checkout
         uses: actions/checkout@v2.0.0