[java] ConstructorCallsOverridableMethod should consider method calls with var access

[vanguard-1024]

Affects PMD Version:6.47.0

Rule:ConstructorCallsOverridableMethod

Please provide the rule name and a link to the rule documentation:
https://pmd.sourceforge.io/pmd-6.48.0/pmd_rules_java_errorprone.html#constructorcallsoverridablemethod

Description:
Hi, we are doing research in testing static analyzer. Our approach found a false negative about the rule ConstructorCallsOverridableMethod.

In the first example below, PMD should have reported a warning at line 4, but not. However, PMD can report the warning at line 3 in the second example. Hence, I think this is a false negative.

First example (False negative)

public class Foo {
  final boolean tag = true;
  public Foo() {
    bar(tag);  // should report a warning at this line
  }
  public void bar(boolean b) {}
}

Second example (Can be detected)

public class Foo {
  public Foo() {
    bar(true);  // should report a warning at this line
  }
  public void bar(boolean b) {}
}

Expected outcome:

PMD should report a violation at line 4, but doesn't. This is a false-negative.

Running PMD through: [CLI]