Add Support for 24-Hour Time Format in DayScheduleListWidget

[yagizdo]

This PR introduces the ability to display times in a 24-hour format within the DayScheduleListWidget. The addition of a boolean is24Hours parameter allows users to specify whether they want to display time in a 24-hour format or stick with the default 12-hour format with AM/PM indicators. This feature enhances the flexibility of the widget to cater to different regional preferences for time display.

Changes:

• Added is24Hours parameter to DayScheduleListWidget and related classes.
• Updated populateValidTimesList method in DayScheduleListWidgetMixin to conditionally generate time slots based on the 24-hour format when is24Hours is true.
• Adjusted the widget and mixin to utilize the is24Hours flag for determining the time format to display.

To-Do:

• Remove AM/PM indicators when is24Hours is set to true, ensuring a pure 24-hour time format is displayed.

This update ensures that the DayScheduleListWidget can be easily configured to match the time format preference of its users, improving its usability across different locales. The todo item highlights an ongoing enhancement to fully adapt the widget for 24-hour time display without AM/PM indicators, further aligning with user expectations in regions that predominantly use the 24-hour clock.