[stable2407] backport paritytech#4937 (paritytech#5337)

Backport paritytech#4937 on the
stable release

Author: alindima

prdoc/pr_4937.prdoc

@@ -0,0 +1,21 @@
+title: "prospective-parachains rework: take II"
+
+doc:
+  - audience: Node Dev
+    description: |
+      Add back support for backing parachain forks. Once a candidate reaches the backing quorum,
+      validators use a shared way of picking the winning fork to back on-chain. This was done in
+      order to increase the likelihood that all backers will vote on the winning fork.
+      The functionality of backing unconnected candidates introduced by the previous rework is preserved.
+
+crates:
+  - name: polkadot-node-core-prospective-parachains
+    bump: minor
+  - name: polkadot-node-subsystem-types
+    bump: minor
+  - name: polkadot-node-subsystem-util
+    bump: minor
+  - name: polkadot-node-core-provisioner
+    bump: none
+  - name: polkadot-statement-distribution
+    bump: none