Occupancy analytics devices bug (#297)

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## Description

1. Supported new device type `NCPS` in analytics occupancy tab.
2. Fixed a bug where the devices weren't being shown.
3. removed old comment.
4. Increased size of `OccupancyEndSideBar` in medium sized screens.
5. Fixed TVOC code to read data.
6. Changed TVOC unit string to match the device. 
7. Fixed data loading bug in AQI.

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [ ] ✨ New feature (non-breaking change which adds functionality)
- [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
- [x] ❌ Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 Code refactor
- [ ] ✅ Build configuration change
- [ ] 📝 Documentation
- [ ] 🗑️ Chore

lib/pages/analytics/modules/occupancy/widgets/occupancy_end_side_bar.dart

@@ -26,7 +26,6 @@ class OccupancyEndSideBar extends StatelessWidget {
               const AnalyticsSidebarHeader(title: 'Presence Sensor'),
               Expanded(
                 child: SizedBox(
-                  // height: MediaQuery.sizeOf(context).height * 0.2,
                   child: PowerClampEnergyStatusWidget(
                     status: [
                       PowerClampEnergyStatus(