Feature: #44297 - Interval presets for cron command of scheduler task

See Issue #44297

Description

To support administrators creating scheduler tasks, presets have been added to the frequency field.

The default presets are:

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['scheduler']['frequencyOptions'] = [
   '0 9,15 * * 1-5' => 'LLL:EXT:scheduler/Resources/Private/Language/locallang.xlf:command.example1',
   '0 */2 * * *' =>  'LLL:EXT:scheduler/Resources/Private/Language/locallang.xlf:command.example2',
   '*/20 * * * *' =>  'LLL:EXT:scheduler/Resources/Private/Language/locallang.xlf:command.example3',
   '0 7 * * 2' =>  'LLL:EXT:scheduler/Resources/Private/Language/locallang.xlf:command.example4',
];