retry_policy: remove clone_boxed() method from RetryPolicy trait

Again, from now on we will prefer storing dyn RetryPolicy behind
an Arc. There is no need for `clone_boxed` method anymore.

Removed `impl Clone for Box<dyn RetryPolicy>`

Author: muzarski

scylla/src/transport/downgrading_consistency_retry_policy.rs

@@ -30,10 +30,6 @@ impl RetryPolicy for DowngradingConsistencyRetryPolicy {
     fn new_session(&self) -> Box<dyn RetrySession> {
         Box::new(DowngradingConsistencyRetrySession::new())
     }
-
-    fn clone_boxed(&self) -> Box<dyn RetryPolicy> {
-        Box::new(DowngradingConsistencyRetryPolicy)
-    }
 }
 
 pub struct DowngradingConsistencyRetrySession {

scylla/src/transport/retry_policy.rs

@@ -29,15 +29,6 @@ pub enum RetryDecision {
 pub trait RetryPolicy: std::fmt::Debug + Send + Sync {
     /// Called for each new query, starts a session of deciding about retries
     fn new_session(&self) -> Box<dyn RetrySession>;
-
-    /// Used to clone this RetryPolicy
-    fn clone_boxed(&self) -> Box<dyn RetryPolicy>;
-}
-
-impl Clone for Box<dyn RetryPolicy> {
-    fn clone(&self) -> Box<dyn RetryPolicy> {
-        self.clone_boxed()
-    }
 }
 
 /// Used throughout a single query to decide when to retry it
@@ -71,10 +62,6 @@ impl RetryPolicy for FallthroughRetryPolicy {
     fn new_session(&self) -> Box<dyn RetrySession> {
         Box::new(FallthroughRetrySession)
     }
-
-    fn clone_boxed(&self) -> Box<dyn RetryPolicy> {
-        Box::new(FallthroughRetryPolicy)
-    }
 }
 
 impl RetrySession for FallthroughRetrySession {
@@ -106,10 +93,6 @@ impl RetryPolicy for DefaultRetryPolicy {
     fn new_session(&self) -> Box<dyn RetrySession> {
         Box::new(DefaultRetrySession::new())
     }
-
-    fn clone_boxed(&self) -> Box<dyn RetryPolicy> {
-        Box::new(DefaultRetryPolicy)
-    }
 }
 
 pub struct DefaultRetrySession {

scylla/src/transport/session_test.rs

@@ -2708,9 +2708,6 @@ async fn test_iter_works_when_retry_policy_returns_ignore_write_error() {
         fn new_session(&self) -> Box<dyn RetrySession> {
             Box::new(MyRetrySession(self.0.clone()))
         }
-        fn clone_boxed(&self) -> Box<dyn RetryPolicy> {
-            Box::new(MyRetryPolicy(self.0.clone()))
-        }
     }
 
     struct MyRetrySession(Arc<AtomicBool>);

scylla/tests/integration/execution_profiles.rs

@@ -95,10 +95,6 @@ impl<const NODE: u8> RetryPolicy for BoundToPredefinedNodePolicy<NODE> {
         self.report_node(Report::RetryPolicy);
         Box::new(self.clone())
     }
-
-    fn clone_boxed(&self) -> Box<dyn RetryPolicy> {
-        Box::new(self.clone())
-    }
 }
 
 impl<const NODE: u8> RetrySession for BoundToPredefinedNodePolicy<NODE> {