[PLAT-15812]Multiple schedule edits increase incremental backup time unbounded

Summary:
We were incrementing next incremental backup schedule time with each edit schedule in an
unbounded fashion. So, incremental backup schedule time kept on increasing even when it should not
have increased. Fixed by checking first that the incremental backup next schedule task time needs an
update or not.

Test Plan: Manual verification

Reviewers: vbansal

Reviewed By: vbansal

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D39305

Author: kv83821-yb

managed/src/main/java/com/yugabyte/yw/common/ScheduleUtil.java

@@ -104,10 +104,10 @@ public static Date nextExpectedIncrementTaskTime(Schedule schedule, Date current
     }
 
     // check if calculated increment backup time is after current time
-    do {
+    while (Util.isTimeExpired(nextIncrementScheduleTaskTime, currentTime)) {
       nextIncrementScheduleTaskTime =
           new Date(nextIncrementScheduleTaskTime.getTime() + incrementFrequency);
-    } while (currentTime.after(nextIncrementScheduleTaskTime));
+    }
 
     return nextIncrementScheduleTaskTime;
   }