Backend: API request for hiding/showing task templates for non-admin users

[arath7]

The backend for hiding/showing task templates to all users within the task template library

What is needed?

• Add a visibleToNonAdmins Field to the CustomizedBattery Schema
• Add a new API route in the src/routes/admin.route.ts file to allow admins to toggle task template visibility (PUT request /visibility)
• for the PUT: maybe have it use a path param to specify on/off so it's clear what you're setting it to be (PUT /visibility/:status where status is "on" or "off" and you could add a validation check for those values in the logic)
• Create a method in the admin.service.ts file to update the visibleToNonAdmins field.
• perhaps an update for dynamic task fetching