Disallow genesis sync outside blob pruning window (#5038)

* Disallow Syncing From Genesis By Default

* Fix CLI Tests

* Perform checks in the `ClientBuilder`

* Tidy, fix tests

* Return an error based on the Deneb fork

* Fix typos

* Fix failing test

* Add missing CLI flag

* Fix CLI flags

* Add suggestion from Sean

* Fix conflict with blob sidecars epochs

---------

Co-authored-by: Mark Mackey <mark@sigmaprime.io>

beacon_node/client/src/config.rs

@@ -78,6 +78,7 @@ pub struct Config {
     pub beacon_processor: BeaconProcessorConfig,
     pub genesis_state_url: Option<String>,
     pub genesis_state_url_timeout: Duration,
+    pub allow_insecure_genesis_sync: bool,
 }
 
 impl Default for Config {
@@ -108,6 +109,7 @@ impl Default for Config {
             genesis_state_url: <_>::default(),
             // This default value should always be overwritten by the CLI default value.
             genesis_state_url_timeout: Duration::from_secs(60),
+            allow_insecure_genesis_sync: false,
         }
     }
 }