functional test: Add ephemeral dust tests

test/functional/test_runner.py

@@ -400,6 +400,7 @@ BASE_SCRIPTS = [
     'rpc_getdescriptorinfo.py',
     'rpc_mempool_info.py',
     'rpc_help.py',
+    'mempool_ephemeral_dust.py',
     'p2p_handshake.py',
     'p2p_handshake.py --v2transport',
     'feature_dirsymlinks.py',