set_time_limit php 8

[brianteeman]

Also see joomla/joomla-cms#41523

Summary of Changes

some hosts disable set_time_limit in php

Prior to PHP 8.0.0, it was possible for the @ operator to disable critical errors that will terminate script execution. For example, prepending @ to a call of a function which did not exist, by being unavailable or mistyped, would cause the script to terminate with no indication as to why.

This PR replaces the @ with a function_exists check

Testing Instructions

code review or in php.ini
disable_functions = set_time_limit

Actual result BEFORE applying this Pull Request

Admin dashboard loads with an error
finder index ends with an error

Expected result AFTER applying this Pull Request

everything works