[PLAT-18819] Create YBA backup task with platform hostname/ip

Summary: Replace placeholder `platform_ip` string with actual platform hostname/ip.

Test Plan:
Create continuous backup config and check the YBA backup task.
Verify the actual platform ip is shown under `Performed on` in the task table.

Before and after the change:
{F409460}

Reviewers: muthu, hzare, nsingh

Reviewed By: hzare, nsingh

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D47864

Author: Jethro-M

managed/src/main/java/com/yugabyte/yw/commissioner/tasks/CreateContinuousBackup.java

@@ -10,7 +10,6 @@
 
 package com.yugabyte.yw.commissioner.tasks;
 
-import static com.yugabyte.yw.common.Util.NULL_UUID;
 import static play.mvc.Http.Status.INTERNAL_SERVER_ERROR;
 
 import com.google.inject.Inject;
@@ -23,6 +22,7 @@
 import com.yugabyte.yw.common.ShellResponse;
 import com.yugabyte.yw.common.StorageUtil;
 import com.yugabyte.yw.common.StorageUtilFactory;
+import com.yugabyte.yw.common.Util;
 import com.yugabyte.yw.common.ha.PlatformReplicationHelper;
 import com.yugabyte.yw.common.ha.PlatformReplicationManager;
 import com.yugabyte.yw.forms.AbstractTaskParams;
@@ -103,12 +103,11 @@ public void runScheduledBackup(
     ScheduleTask.create(taskUUID, schedule.getScheduleUUID());
     CustomerTask.create(
         customer,
-        NULL_UUID,
+        Util.NULL_UUID,
         taskUUID,
         CustomerTask.TargetType.Yba,
         CustomerTask.TaskType.CreateYbaBackup,
-        // TODO: Actually get platform IP
-        "platform_ip");
+        Util.getYwHostnameOrIP());
     log.info("Submitted continuous yba backup creation with task uuid = {}.", taskUUID);
   }