Meta-monitoring mixin dashboards rely on deprecated visualisation plugin

[hedss]

Describe the bug
The Meta-monitoring dashboards in operation/[tempo-mixin/tempo-mixin-compiled] still work, but are based on the old timeseries data graph, pre-Grafana 10.

To Reproduce
Steps to reproduce the behavior:

1. Install Tempo, scrape metrics from each service
2. Install mixin dashboards and view
3. Note warning in top left of affected visualisation panels

Expected behavior
No warning should occur and the newer timeseries graph visualisation should be used.

Environment:

• Infrastructure: N/A
• Deployment tool: N/A