Explicitly Handling ProvisionableData Cases (#6757)

* Initial pass

* fmt

* Lock changes

* Implementers guide edit

* Reasoning changes

* typo

Co-authored-by: Marcin S. <marcin@bytedude.com>

* Revert "Lock changes"

This reverts commit 3131a5245c6349743789270e6d1ad7842dc4c9df.

* Getting rid of cargo.lock changes

* Argumentation update

* fmt

---------

Co-authored-by: Marcin S. <marcin@bytedude.com>

polkadot/node/core/backing/src/lib.rs

@@ -774,7 +774,7 @@ async fn validate_and_make_available(
 			Err(candidate)
 		},
 		ValidationResult::Invalid(reason) => {
-			gum::debug!(
+			gum::warn!(
 				target: LOG_TARGET,
 				candidate_hash = ?candidate.hash(),
 				reason = ?reason,