[Dashboard][Metrics] Add support to not-aggregate a dimension but instead show multiple "series" per dimension values

### Is there an existing issue for this?

- [x] I have searched the existing issues

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

Metric view aggregates values from all filtered-in values of all dimensions and shows single data series. This makes it hard(er) to compare stuff.

### Describe the solution you'd like

Add option to not aggregate all values of dimension but instead show per-dimension-value series.

to


### Additional context

As it's possible in graphana, e.g.

Start by locating the Dashboard Metrics view and the code that aggregates filtered dimension values. Use the issue's before-and-after screenshots to understand the intended series behavior. Done means users can choose not to aggregate a dimension and can compare separate series for its values; no file or test is named in the issue.

Written by the indexing model from the issue text.