test: enable functional tests with large rpc args for cli

Also, the following tests (for which self.supports_cli = False was not
set) will now work with --usecli:

feature_fastprune.py
feature_fee_estimation.py
feature_reindex_readonly.py
feature_taproot.py
mempool_package_rbf.py
p2p_net_deadlock.py
p2p_tx_download.py
rpc_packages.py

test/functional/feature_pruning.py

@@ -69,7 +69,6 @@ class PruneTest(BitcoinTestFramework):
     def set_test_params(self):
         self.setup_clean_chain = True
         self.num_nodes = 6
-        self.supports_cli = False
         self.uses_wallet = None
 
         # Create nodes 0 and 1 to mine.