grafana: The resource group selector in Resource Control Page has no effect

[glorv]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

After Selecting resource group, all panels still show metrics of all resource groups.

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

nightly