Structured logs should interpolate message templates.

### 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.

When viewing the logs in the dashboard with default settings, the message only shows the message template variable name and not the actual value. To see the actual value one has to open the details and look for the value.

### Describe the solution you'd like

The dashboard should visually just inline the variables into the message. Grafana does the same thing with the default settings.

### Additional context

I'm aware of the setting for the otel export to include the formatted message instead. In my option the default is fine for prod deployments to minimize duplication. But for dev this is only annoying. An alternative would be to set the options via the env config to include the formatted message for project resources.

Start at the dashboard's structured-log rendering entry point and trace how the message template and its variable values are represented, comparing the default view with the details view. Done means the default dashboard view visibly interpolates the variables while retaining the existing option to avoid exporting formatted messages.

Written by the indexing model from the issue text.