Metrics Drilldown: Cannot get primary label from URL error reported while navigating

### What happened? Navigating a default Grafana environment to test some OpenTelemetry-generated metrics and logs leads to a `Fatal error! Cannot get primary label from URL! getPrimaryLabelFromUrl should not be called when the app is embedded` Stack trace reported: ``` Error: Cannot get primary label from URL! getPrimaryLabelFromUrl should not be called when the app is embedded at https://grafana.localhost/public/plugins/grafana-lokiexplore-app/553.js?_cache=794fb3650c429dc76c08:1:326699 at _ (https://grafana.localhost/public/plugins/grafana-lokiexplore-app/553.js?_cache=794fb3650c429dc76c08:1:326960) at ae.getLabelFiltersStatus (https://grafana.localhost/public/plugins/grafana-lokiexplore-app/553.js?_cache=794fb3650c429dc76c08:1:296885) at https://grafana.localhost/public/plugins/grafana-lokiexplore-app/553.js?_cache=794fb3650c429dc76c08:1:297484 at Object.next (https://grafana.localhost/public/plugins/grafana-lokiexplore-app/812.js?_cache=26fdc5542d46a05f4dd8:2:73997) at ce.next (https://grafana.localhost/public/build/5671.8f89a9563187b547478e.js:113:9552) at de._next (https://grafana.localhost/public/build/5671.8f89a9563187b547478e.js:113:9144) at de.next (https://grafana.localhost/public/build/5671.8f89a9563187b547478e.js:113:8765) at u.c (https://grafana.localhost/public/build/5923.dcb4525a5c9b33f4163a.js:1:17419) at u.emit (https://grafana.localhost/public/build/5671.8f89a9563187b547478e.js:7:2273) ``` ### What did you expect to happen? To be back at the top-level **Metrics** Drilldown view and not get an error thrown. ### Did this work before? N/A ### How do we reproduce it? 1. Set up a local observability stack, with Grafana, Alloy, Loki, Prometheus, and Tempo, along with some generated metrics and telemetry via `opentelemetry-collector-contrib`'s telemetrygen. 2. Open the local Grafana URL in your browser 3. Click on **Drilldown** to open the dropdown menu 4. Click on **Metrics** 5. Click on **Logs** 6. Click on any o…