Feature: new visualization plugin

[MatiasArriola]

📌 References

• Issue: https://app.clickup.com/t/8696vv89u #8696vv89u

📝 Implementation

• I initially removed all references to the .js plugin, but then realized that event visualizations wouldn't work with its iframe replacement, so I kept both implementations.
• Now legacy Plugin scripts are loaded only if required
• Created a separate PluginVisualizationRepository. Each get is performed individually instead of batching all the requests at the repository level.
• eventCharts and eventReports are unified into eventVisualizations, as per DHIS docs.
• I have left a placehoder for OrgUnit filtering.

🔥 Testing

• Use any DHIS 39+ instance with some dashboards loaded to test.
• Older versions may work, as long as they implement the eventVisualizations endpoint.
• During testing, I encountered intermittent issues that I still need to investigate and couldn't reproduce again. These may be related to the DHIS instances used.
  • Inside the Map Visualizations, a form appeared instead of the map.
  • iframes stopped reporting installationStatus correctly
  • Timeout errors in the postRobot communication