test: whitelist rpc_rawtransaction peers to speed up tests

in my testing from 45-55 seconds to 15.

test/functional/rpc_rawtransaction.py

@@ -56,6 +56,10 @@ class RawTransactionsTest(BitcoinTestFramework):
             ["-txindex"],
             ["-txindex"],
         ]
+        # whitelist all peers to speed up tx relay / mempool sync
+        for args in self.extra_args:
+            args.append("-whitelist=noban@127.0.0.1")
+
         self.supports_cli = False
 
     def skip_test_if_missing_module(self):