Remove instrumenting log level (#7620)

I think this should resolve #7155


This removes the level field from the instrumenting we were doing across a range of functions. The level will now default to the level of the log.

beacon_node/network/src/sync/block_lookups/mod.rs

@@ -139,7 +139,6 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
 
     #[cfg(test)]
     #[instrument(parent = None,
-        level = "info",
         fields(service = "lookup_sync"),
         name = "lookup_sync",
         skip_all