Logs volume should not use parser if not needed

[ivanahuckova]

@cyriltovena the largest query on service index page - to fetch to top services is not using any parser

However, on the service detail page, it would be more complex to determine whether we have some detected fields selected or not (if we need a parser to make query with detected fields work). Of course, it is doable, but considering at the moment, have a lot of issues with state, I would probably wait to resolve them and then optimize when this is more stable.

So keeping this in No Status

Also more in https://raintank-corp.slack.com/archives/C05FWM2DN07/p1712171252433889?thread_ts=1712165843.027599&cid=C05FWM2DN07

[ivanahuckova]

Blocked by detected_fields PR and refactor of query creation logic.

[ivanahuckova]

Might be solved by #257

[gtk-grafana]

Should be fixed by #736