Next maintenance date should be set by user

[Baalmart]

Is your feature request related to a problem? Please describe.

• The hardware user does not understand where the data for the maintenance periods comes from. So the cards in the device management page do not make sense to them.
• What is the default (is it 3 months between maintenance and 2 weeks before it becomes due) and if the user wants to change this how does that happen? Do they need to contact admin or airqo. Ideally Admin should be able to do this but this is low priority

Describe the solution you'd like
The hardware user should be able to add their own maintenance due date under the maintenance log section for each device.

Describe alternatives you've considered

• The user should be able to change the next maintenance date based on their preference.
• The system can have default next maintenance date but can allow the user to change it in the preferences section.

Additional context
This stems from the hardware team which would like to have some sort of control so that most configuration changes can happen from the frontend and not require SEs to make system updates for them accordingly.

Also see this image below which shows the "maintenance windows" as shared by the hardware team. So this could be a good reference when dealing with system wide settings.