the lastChecked date for Biosecurity Alerts is used properly

[qifeng-bai]

If the lastChecked date is not updated, Biosecurity will search for records within a 7-day time window, which works fine in most cases.

However, if the scheduled task is paused and then resumed after a few weeks, the alerts will not return results from the last checked date.

Problem 2:
When we click 'preview', the record should not be saved into DB
Reason:
userService was defined as Transactional
def user = userService.getUserByEmail(alaUser?.email)

[qifeng-bai]

The method used to get the last checked date only works for Biosecurity alerts.

    def getLastCheckedDate(Query query) {
        def lastCheckedDate = null
        def queryResult = QueryResult.findByQuery(query)
        if (queryResult) {
            lastCheckedDate = queryResult.lastChecked
        }
        lastCheckedDate
    }

The other alerts may have 4 last checked date from hourly, monthly, daily, weekly subscribers