[perflint] Catch a wider range of mutations in PERF101 (#9955)

## Summary

This PR ensures that if a list `x` is modified within a `for` loop, we
avoid flagging `list(x)` as unnecessary. Previously, we only detected
calls to exactly `.append`, and they couldn't be nested within other
statements.

Closes https://github.com/astral-sh/ruff/issues/9925.

crates/ruff_python_ast/src/helpers.rs

@@ -935,7 +935,7 @@ where
     }
 }
 
-/// A [`StatementVisitor`] that collects all `return` statements in a function or method.
+/// A [`Visitor`] that collects all `return` statements in a function or method.
 #[derive(Default)]
 pub struct ReturnStatementVisitor<'a> {
     pub returns: Vec<&'a ast::StmtReturn>,