test: move-only: Move all generate* tests to a single file

Can be reviewed with
--color-moved=dimmed-zebra

test/functional/test_runner.py

@@ -235,7 +235,6 @@ BASE_SCRIPTS = [
     'p2p_eviction.py',
     'wallet_signmessagewithaddress.py',
     'rpc_signmessagewithprivkey.py',
-    'rpc_generateblock.py',
     'rpc_generate.py',
     'wallet_balance.py --legacy-wallet',
     'wallet_balance.py --descriptors',