Logs Samples: Panel wrongly visible when using datasource without Log-Sample support

[svennergr]

What happened:

We added the Logs sample feature a couple of weeks ago. That panel is used for datasources which can provide samples of logs when their data representation is not logs. With other words, this is mainly used for Loki's metric queries to see some samples of the underlying log data.
However with the change in #63036 the relevant logic to display or hide the container was changed.

Basically the container relies on this logic here:
https://github.com/grafana/grafana/blob/main/public/app/features/explore/Explore.tsx#L578

Mainly, when logsSample.dataProvider is undefined the panel will be hidden. However in #63036 there was a change of the default return value of such data providers: https://github.com/grafana/grafana/pull/63036/files#diff-dd4066243e4f35893e0fa409792e0901d44cebd250b8fc3784e1a1d0718b5782R129-R132

What you expected to happen:

Logs sample container for other datasources then Loki.

How to reproduce it (as minimally and precisely as possible):

1. Start Grafana
2. Start a Tempo
3. Go to Explore and make a query to Tempo
4. Logs sample is visible below the trace result table

Environment:

• Grafana version: main (9.5.0-53559pre)