feat: sigint initialization only after snapshots is applied (#1356)

## What ❔

Moved sigint initialization to after snapshots is applied

## Why ❔

Currently sigint support is broken for snapshots db recovery, this PR
moves custom sigint to a later stage, so that it's no longer a problem

---------

Signed-off-by: tomg10 <lemures64@gmail.com>

core/bin/external_node/src/main.rs

@@ -519,7 +519,6 @@ async fn main() -> anyhow::Result<()> {
     let main_node_client = <dyn MainNodeClient>::json_rpc(&main_node_url)
         .context("Failed creating JSON-RPC client for main node")?;
 
-    let sigint_receiver = setup_sigint_handler();
     tracing::warn!("The external node is in the alpha phase, and should be used with caution.");
     tracing::info!("Started the external node");
 
@@ -569,6 +568,7 @@ async fn main() -> anyhow::Result<()> {
         opt.enable_snapshots_recovery,
     )
     .await?;
+    let sigint_receiver = setup_sigint_handler();
 
     // Revert the storage if needed.
     let reverter = BlockReverter::new(