Remove dead code (#10030)

* Remove dead code

* Remove unused dependencies

* `allow(dead_code)` -> `expect(dead_code)`

* ast-grep: rule-tests/*-test.yml => tests/*-test.yml

For brevity.

* ast-grep: forbid allow(dead_code)

lib/edge/python/src/utils.rs

@@ -13,14 +13,4 @@ impl PyEdgeShard {
             )))
         }
     }
-
-    pub fn get_shard_mut(&mut self) -> Result<&mut EdgeShard, PyError> {
-        if let Some(shard) = &mut self.0 {
-            Ok(shard)
-        } else {
-            Err(PyError::from(OperationError::service_error(
-                "Shard is not initialized",
-            )))
-        }
-    }
 }