Standardize Grafana dashboard timezones

[davidumea]

Is your feature request related to a problem? Please describe.

The default timezone in each of our Grafana dashboards are quite inconsistent, and they can't be changed through the Grafana GUI since they were created by another source. So when you update timezone in a dashboard through the top right time picker it doesn't persist and gets reset every time you refresh the page. Maybe the most frustrating part is that we have different timezones in different dashboards.

Describe the solution you'd like

Change the default timezone in all of our dashboards to default organization timezone, which is just an empty string in the JSON model ""

Any Grafana admin can change the default organization timezone, this means that the timezone will be the same for every user that is logged in.

Describe alternatives you've considered

An alternative was to change the timezones to "browser" timezone, but this can cause confusion if people are in different timezones.

Additional context

Definition of done:

All of our Grafana dashboards are using the same timezone.