fix: fail fast when escrow accounts are missing

Previsously, paid queries would stall until timeout while awaiting the
initial eventual value for escrow accounts. This change avoids the
delay, such that the intended error message is returned.

common/src/tap_manager.rs

@@ -68,14 +68,10 @@ impl TapManager {
             })?;
         if !self
             .escrow_accounts
-            .value()
-            .await
-            .map(|accounts| {
-                accounts
-                    .get(&receipt_signer)
-                    .map_or(false, |balance| balance > &U256::zero())
-            })
-            .unwrap_or(false)
+            .value_immediate()
+            .unwrap_or_default()
+            .get(&receipt_signer)
+            .map_or(false, |balance| balance > &U256::zero())
         {
             return Err(anyhow!(
                 "Receipt sender `{}` is not eligible for this indexer",