test: re-bucket long-running tests

- p2p_node_network_limited -v*transport
- feature_assume_utxo

On CI runners these tests are taking longer than their current bucket
suggests, often being among the last to finish.

Re-bucket them to improve CI efficiency.

Author: willcl-ark

test/functional/test_runner.py

@@ -96,10 +96,13 @@
     'feature_fee_estimation.py',
     'feature_taproot.py',
     'feature_block.py',
+    'p2p_node_network_limited.py --v1transport',
+    'p2p_node_network_limited.py --v2transport',
     # vv Tests less than 2m vv
     'mining_getblocktemplate_longpoll.py',
     'p2p_segwit.py',
     'feature_maxuploadtarget.py',
+    'feature_assumeutxo.py',
     'mempool_updatefromblock.py',
     'mempool_persist.py --descriptors',
     # vv Tests less than 60s vv
@@ -354,7 +357,6 @@
     'wallet_coinbase_category.py --descriptors',
     'feature_filelock.py',
     'feature_loadblock.py',
-    'feature_assumeutxo.py',
     'wallet_assumeutxo.py --descriptors',
     'p2p_dos_header_tree.py',
     'p2p_add_connections.py',
@@ -385,8 +387,6 @@
     'feature_coinstatsindex.py',
     'wallet_orphanedreward.py',
     'wallet_timelock.py',
-    'p2p_node_network_limited.py --v1transport',
-    'p2p_node_network_limited.py --v2transport',
     'p2p_permissions.py',
     'feature_blocksdir.py',
     'wallet_startup.py',