Clean up delinquency slot distance computation (#10479)

automerge

client/src/rpc_request.rs

@@ -103,6 +103,9 @@ pub const NUM_LARGEST_ACCOUNTS: usize = 20;
 pub const MAX_GET_SIGNATURE_STATUSES_QUERY_ITEMS: usize = 256;
 pub const MAX_GET_CONFIRMED_SIGNATURES_FOR_ADDRESS_SLOT_RANGE: u64 = 10_000;
 
+// Validators that are this number of slots behind are considered delinquent
+pub const DELINQUENT_VALIDATOR_SLOT_DISTANCE: u64 = 128;
+
 impl RpcRequest {
     pub(crate) fn build_request_json(self, id: u64, params: Value) -> Value {
         let jsonrpc = "2.0";