policy: Remove CPFP carveout rule

The addition of a cluster size limit makes the CPFP carveout rule useless,
because carveout cannot be used to bypass the cluster size limit. Remove this
policy rule and update tests to no longer rely on the behavior.

test/functional/test_runner.py

@@ -254,7 +254,6 @@ BASE_SCRIPTS = [
     'feature_utxo_set_hash.py',
     'feature_rbf.py',
     'mempool_packages.py',
-    'mempool_package_onemore.py',
     'mempool_package_limits.py',
     'mempool_package_rbf.py',
     'tool_utxo_to_sqlite.py',