rpc: use minimal mode by default (backport #22734) (#22879)

* rpc: use minimal mode by default

(cherry picked from commit eac4a6df68)

# Conflicts:
#	local-cluster/tests/local_cluster.rs

* test-validator-bin: reinstate full rpc method set

Co-authored-by: Trent Nelson <trent@solana.com>

multinode-demo/validator.sh

@@ -248,6 +248,7 @@ default_arg --identity "$identity"
 default_arg --vote-account "$vote_account"
 default_arg --ledger "$ledger_dir"
 default_arg --log -
+default_arg --full-rpc-api
 
 if [[ $maybeRequireTower = true ]]; then
   default_arg --require-tower