Changes in server

1. All *_foreach() functions must not include unsupported items (see this)

2. Aggregate count() and count_foreach() must support operator and pattern, same as for historical count() (see ZBXNEXT-7927)
Example:
count(last_foreach(/*/vfs.fs.dependent.size[*,pused]),"gt",95) - count filesystems with low disk space across all hosts
sum(count_foreach(/*/backup.status[*],1d,"eq","failed")) - count backup failures in the last day across all hosts

3. last_foreach() must support a period as 2nd parameter (see ZBX-22007)
Example: avg(last_foreach(/*/system.cpu.util,1h)) - average CPU utilization between all hosts that reported CPU utilization within the last hour
Changes in Frontend/API
Add validation for the new parameters