Fail fast if account paths cannot be canonicalized (#7300)

* Canonicalize account paths to avoid symlink issues

* fixes

core/src/validator.rs

@@ -60,7 +60,7 @@ pub struct ValidatorConfig {
     pub transaction_status_service_disabled: bool,
     pub blockstream_unix_socket: Option<PathBuf>,
     pub storage_slots_per_turn: u64,
-    pub account_paths: Option<String>,
+    pub account_paths: Vec<PathBuf>,
     pub rpc_config: JsonRpcConfig,
     pub snapshot_config: Option<SnapshotConfig>,
     pub max_ledger_slots: Option<u64>,
@@ -80,7 +80,7 @@ impl Default for ValidatorConfig {
             blockstream_unix_socket: None,
             storage_slots_per_turn: DEFAULT_SLOTS_PER_TURN,
             max_ledger_slots: None,
-            account_paths: None,
+            account_paths: Vec::new(),
             rpc_config: JsonRpcConfig::default(),
             snapshot_config: None,
             broadcast_stage_type: BroadcastStageType::Standard,
@@ -469,7 +469,7 @@ impl Validator {
 pub fn new_banks_from_blocktree(
     expected_genesis_hash: Option<Hash>,
     blocktree_path: &Path,
-    account_paths: Option<String>,
+    account_paths: Vec<PathBuf>,
     snapshot_config: Option<SnapshotConfig>,
     poh_verify: bool,
     dev_halt_at_slot: Option<Slot>,