Y-Axis cursors are incorrectly synchronized

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

1. Create a dashboard
2. Add a line chart widget for a duration metric that ranges between 0 and 300
3. Add a line chart widget for a count metric that ranges between 0 and 300
4. Hover over one of the charts

### Expected Result

The x-axis marker is synced, since they use the same time range. The y-axis marker is not synced, since the two charts use different data units

### Actual Result

Both the x-axis and y-axis markers are synced.

This is also possible to reproduce in Insights and Metrics if the data set y-axis ranges match, so this is a bug deeper in ECharts. It might be possible to sync them in another way, or somehow specify that the units don't match so the y-axes don't sync.


### Product Area

Dashboards