Extended folding does not fold records

The extended folding feature does not add folding regions for records.

Extracted from #2439

### Steps to reproduce
Create the following class:
```java
package test;

public class RecordTest {
record A() {

}

record B(
int a,
String b) {

public B(int a, String b) {
this.a = a;
this.b = b;
}

}
}
```

### Expected result
If Window > Preferences > Java > Editor > Folding > Extended Folding is disabled, there are folding regions for both records:

This should also be the case if this preference is enabled

### Actual result

If Window > Preferences > Java > Editor > Folding > Extended Folding is enabled, these folding regions are missing:

Reproduce the issue with the provided RecordTest class and compare Java Editor folding with Extended Folding disabled and enabled. Start by tracing the Java editor folding behavior controlled by Window > Preferences > Java > Editor > Folding > Extended Folding. Done means both record declarations have folding regions when Extended Folding is enabled, as they do when it is disabled.

Written by the indexing model from the issue text.