Only load Kzg in tests if necessary and only load it once (#5555)

* Only load KZG once if necessary  in tests.

beacon_node/execution_layer/src/test_utils/execution_block_generator.rs

@@ -155,7 +155,7 @@ impl<E: EthSpec> ExecutionBlockGenerator<E> {
         shanghai_time: Option<u64>,
         cancun_time: Option<u64>,
         prague_time: Option<u64>,
-        kzg: Option<Kzg>,
+        kzg: Option<Arc<Kzg>>,
     ) -> Self {
         let mut gen = Self {
             head_block: <_>::default(),
@@ -172,7 +172,7 @@ impl<E: EthSpec> ExecutionBlockGenerator<E> {
             cancun_time,
             prague_time,
             blobs_bundles: <_>::default(),
-            kzg: kzg.map(Arc::new),
+            kzg,
             rng: make_rng(),
         };
 

beacon_node/execution_layer/src/test_utils/mock_execution_layer.rs

@@ -43,7 +43,7 @@ impl<E: EthSpec> MockExecutionLayer<E> {
         prague_time: Option<u64>,
         jwt_key: Option<JwtKey>,
         spec: ChainSpec,
-        kzg: Option<Kzg>,
+        kzg: Option<Arc<Kzg>>,
     ) -> Self {
         let handle = executor.handle().unwrap();
 

beacon_node/execution_layer/src/test_utils/mod.rs

@@ -109,7 +109,7 @@ impl<E: EthSpec> MockServer<E> {
     pub fn new_with_config(
         handle: &runtime::Handle,
         config: MockExecutionConfig,
-        kzg: Option<Kzg>,
+        kzg: Option<Arc<Kzg>>,
     ) -> Self {
         let MockExecutionConfig {
             jwt_key,
@@ -193,7 +193,7 @@ impl<E: EthSpec> MockServer<E> {
         shanghai_time: Option<u64>,
         cancun_time: Option<u64>,
         prague_time: Option<u64>,
-        kzg: Option<Kzg>,
+        kzg: Option<Arc<Kzg>>,
     ) -> Self {
         Self::new_with_config(
             handle,