net: use V2Transport when NODE_P2P_V2 service flag is present

Co-authored-by: Dhruv Mehta <856960+dhruv@users.noreply.github.com>

test/functional/test_runner.py

@@ -246,6 +246,7 @@ BASE_SCRIPTS = [
     'p2p_invalid_locator.py',
     'p2p_invalid_block.py',
     'p2p_invalid_tx.py',
+    'p2p_v2_transport.py',
     'example_test.py',
     'wallet_txn_doublespend.py --legacy-wallet',
     'wallet_multisig_descriptor_psbt.py --descriptors',