feat: EXC-1659: Enable storage reservation mechanism on verified appl…

…ication subnets (dfinity#1930)

This enables the storage reservation mechanism on verified application
subnets. The storage reservation mechanism has been enabled for a while
on application subnets and so it's time that this is enabled for
verified application subnets as well. This helps bring closer the
configuration between application and verified application subnets.

rs/config/src/subnet_config.rs

@@ -421,13 +421,6 @@ pub struct CyclesAccountManagerConfig {
 
 impl CyclesAccountManagerConfig {
     pub fn application_subnet() -> Self {
-        Self {
-            max_storage_reservation_period: Duration::from_secs(300_000_000),
-            ..Self::verified_application_subnet()
-        }
-    }
-
-    pub fn verified_application_subnet() -> Self {
         Self {
             reference_subnet_size: DEFAULT_REFERENCE_SUBNET_SIZE,
             canister_creation_fee: Cycles::new(100_000_000_000),
@@ -451,13 +444,15 @@ impl CyclesAccountManagerConfig {
             http_request_quadratic_baseline_fee: Cycles::new(60_000),
             http_request_per_byte_fee: Cycles::new(400),
             http_response_per_byte_fee: Cycles::new(800),
-            // This effectively disables the storage reservation mechanism on
-            // verified application subnets.
-            max_storage_reservation_period: Duration::from_secs(0),
+            max_storage_reservation_period: Duration::from_secs(300_000_000),
             default_reserved_balance_limit: DEFAULT_RESERVED_BALANCE_LIMIT,
         }
     }
 
+    pub fn verified_application_subnet() -> Self {
+        Self::application_subnet()
+    }
+
     /// All processing is free on system subnets
     pub fn system_subnet() -> Self {
         Self {