tests: functional watch-only wallet tests

These test the new watch-only defaults for rpcs with include_watchonly
and includeWatching options.

Signed-off-by: William Casarin <jb55@jb55.com>

test/functional/test_runner.py

@@ -127,6 +127,8 @@ BASE_SCRIPTS = [
     'wallet_multiwallet.py --usecli',
     'wallet_createwallet.py',
     'wallet_createwallet.py --usecli',
+    'wallet_watchonly.py',
+    'wallet_watchonly.py --usecli',
     'interface_http.py',
     'interface_rpc.py',
     'rpc_psbt.py',