Allow perf metrics to be disabled on dashboard/status page

Is your feature request related to a problem? Please describe. Currently, there's no way to disable performance metrics from being displayed on public dashboards (status page).

Describe the solution you'd like Include a checkbox on the dashboard's edit page to disable displaying performance metrics.

Describe alternatives you've considered Considered using CSS to hide performance metrics, but this has a few problems:

1. It only hides them, but they're still available on the HTML;
2. It also hides the availability/uptime percentage, as it shares the CSS class with the P metrics;
3. The width of the graphs doesn't increase/adjust, so we end up with a white space where metrics were being displayed;
4. Should the CSS class change, the work around will not work anymore.

Additional context Without that toggle we won't be able to use the public dashboard and will need to consider other solution for this, which decreases the value we get from using Checkly.

original GH issue link https://github.com/checkly/public-roadmap/issues/303