polish constants (#914)

## 📝 Summary

Increased ORDER_JOURNAL_CHANNEL_SIZE x 10 since it would get filled in
busy slots.
Removed 2 unused constants.

## ✅ I have completed the following steps:

* [X] Run `make lint`
* [X] Run `make test`
* [ ] Added tests (if applicable)

Author: ZanCorDX

crates/rbuilder-operator/src/clickhouse.rs

@@ -536,7 +536,8 @@ impl BidObserver for BuiltBlocksWriter {
 }
 
 /// Channel size for the order journal. Orders are small and arrive frequently.
-const ORDER_JOURNAL_CHANNEL_SIZE: usize = 10 * 1024;
+/// A busy slow can have 30K-40K orders. 100K should be more than enough.
+const ORDER_JOURNAL_CHANNEL_SIZE: usize = 100 * 1024;
 
 #[derive(Debug, Clone, Eq, PartialEq, Hash)]
 struct SlotKey {

crates/rbuilder/src/live_builder/order_input/mod.rs

@@ -129,8 +129,6 @@ pub struct OrderInputConfig {
 }
 
 pub const DEFAULT_SERVE_MAX_CONNECTIONS: u32 = 4096;
-pub const DEFAULT_RESULTS_CHANNEL_TIMEOUT: Duration = Duration::from_millis(50);
-pub const DEFAULT_INPUT_CHANNEL_BUFFER_SIZE: usize = 10_000;
 
 impl OrderInputConfig {
     #[allow(clippy::too_many_arguments)]