[PLAT-16169] change DR op timeout config value format

Summary: change config value format to not separate decimal places so they're not confused with string types

Test Plan: N/A

Reviewers: cwang, vbansal

Reviewed By: vbansal

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D40293

managed/src/main/resources/reference.conf

@@ -293,8 +293,8 @@ yb {
     xcluster_sync_scheduler_interval = 10 minutes
     xcluster_metrics_scheduler_interval = 2 minutes
     xcluster_sync_on_universe = true
-    get_api_timeout_ms = 15_000
-    db_sync_timeout_ms = 120_000
+    get_api_timeout_ms = 15000
+    db_sync_timeout_ms = 120000
   }
 
   # Enable/Disable Runtime Config UI under Admin section