Use Flux query profiling and expose through header

As we did for forced tracing, we want to force profiling of a query (see https://github.com/influxdata/flux/issues/2443) in InfluxDB by setting some header into the Query Request.

See https://github.com/influxdata/influxdb/pull/16559 for an example on how to do it.

Start by reading Flux issue 2443 and the linked InfluxDB pull request 16559, which shows the analogous forced-tracing change. Trace that implementation to identify the query request entry point; done means a request header can force Flux query profiling as described.

Written by the indexing model from the issue text.