fatxpool: fork aware transaction pool is now default (#8838)

This PR changes the node's default transaction pool to the fork aware
implementation.

---------

Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: michalkucharczyk

prdoc/pr_8838.prdoc

@@ -0,0 +1,7 @@
+title: '`fatxpool`: fork aware transaction pool is now default'
+doc:
+- audience: Node Operator
+  description: This PR changes the default transaction pool to the fork aware implementation. The old implementation can be still used with `--pool-type=single-state` command line argument.
+crates:
+- name: sc-cli
+  bump: major

substrate/client/cli/src/params/transaction_pool_params.rs

@@ -57,7 +57,7 @@ pub struct TransactionPoolParams {
 	pub tx_ban_seconds: Option<u64>,
 
 	/// The type of transaction pool to be instantiated.
-	#[arg(long, value_enum, default_value_t = TransactionPoolType::SingleState)]
+	#[arg(long, value_enum, default_value_t = TransactionPoolType::ForkAware)]
 	pub pool_type: TransactionPoolType,
 }