[provide a description of the issue]

Environment

Operating System: Windows11
JDK version: 17
Visual Studio Code version: 1.88
Java extension version: 1.29

Steps To Reproduce

1. select "20"
2. click “Refacator-Extract local variable”
3. new variable name " existingVariable"

public class OriginalClass {
public void method() {
int existingVariable = 10;
// extract variable "20" , name :"existingVariable"
System.out.println(20);
}
}

refactoring result:

Reason: When extracting local variables, there was no detection of naming conflicts between the new variable name and the context

Expected behavior: Check for naming conflicts before and after refactoring, and provide warning prompts