Remove superflous parameter overseer_enable_anyways and make parachain node type more explicit (#7617)

* Remove superflous parameter `overseer_enable_anyways`

We don't need this flag, as we don't need the overseer enabled when the
node isn't a collator or validator.

* Rename `IsCollator` to `IsParachainNode`

`IsParachainNode` is more expressive and also encapsulates the state of
the parachain node being a full node. Some functionality like the
overseer needs to run always when the node runs alongside a parachain
node. The parachain node needs the overseer to e.g. recover PoVs. Other
things like candidate validation or pvf checking are only required for
when the node is running as validator.

* FMT

* Fix CI

polkadot/node/network/statement-distribution/src/responder.rs

@@ -62,8 +62,8 @@ pub async fn respond(
 		//
 		// 1. We want some requesters to have full data fast, rather then lots of them having them
 		//    late, as each requester having the data will help distributing it.
-		// 2. If we take too long, the requests timing out will not yet have had any data sent,
-		//    thus we wasted no bandwidth.
+		// 2. If we take too long, the requests timing out will not yet have had any data sent, thus
+		//    we wasted no bandwidth.
 		// 3. If the queue is full, requestes will get an immediate error instead of running in a
 		//    timeout, thus requesters can immediately try another peer and be faster.
 		//