Fixes and improvements for Dynamic & random schedule tasks #350

Changes proposed in this PR required to rune below sql query for migration.

ALTER TABLE DYNAMIC_TASK MODIFY COLUMN CRON VARCHAR(100);
ALTER TABLE DYNAMIC_TASK MODIFY COLUMN TASK_CLASS_NAME VARCHAR(1000);
ALTER TABLE DYNAMIC_TASK_PROPERTIES MODIFY COLUMN PROPERTY_VALUE TEXT;
ALTER TABLE DYNAMIC_TASK_PROPERTIES MODIFY COLUMN TENANT_ID INTEGER DEFAULT 0;

                             operationTimeoutConfig.getInitialStatus());
             for (Activity activity : activities) {
                 for (ActivityStatus activityStatus : activity.getActivityStatus()) {
                     String operationId = activity.getActivityId().replace("ACTIVITY_", "");

Fixes and improvements for Dynamic & random schedule tasks #350

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