Admin Users should have option to select between Real Time or Pre-Processed when creating segments

[Starker3]

Summary

Admin users should preferably have the option to choose between Real-Time segments and Pre-Processed segments.
Currently only a Super User has the option to choose anything other than the default option for processing segments:

Would likely want to keep this disabled by default and allow Super Users to enable this setting?

Sort of related to #6844

[tsteur]

@Starker3 do you have the output of the system report maybe? This way we could replicate some settings potentially just in case it depends on the settings.

[Starker3]

@tsteur system check attached
matomo_system_check_02-03-2021.txt

[tsteur]

Thanks for this @Starker3 this seems to be not shown by default. Thought this was the case already. The API does only require view permissions already AFAIK so this could be also exposed to the UI. It might be bit hard to understand for people though when to choose what so we'd need to maybe review again how that works / how it is configured.