Slow completion and insertion into a gradle project

### Apache NetBeans version

Apache NetBeans 20 release candidate

### What happened

Code completion, and especially code insertion, is much slower with a Gradle project than with a Maven project.

### How to reproduce

Just clone the https://github.com/philippefichet/slow-netbeans-example repository and see how long it takes to complete and insert code in the "src/main/java/com/github/philippefichet" class.
/OneEntity.java" class.
On line 17, do this between "return new Str" and "ing();" and complete with the "String (java.lang)" propotition
In the Maven project, insertion is fast, whereas in the Gradle project it's much slower.
A JFR screenshot for Gradle and Maven and an animated screenshot for Gradle and Maven are available in the repository.

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Edition: Windows 10 Professionnel, Version: 22H2, Build: 19045.3693

### JDK

Zulu21.28+85-CA

### Apache NetBeans packaging

Apache NetBeans binary zip

### Anything else

Slowness is less noticeable under Linux, but still seems to be present.

### Are you willing to submit a pull request?

No

Clone the linked slow-netbeans-example repository and reproduce completion and insertion in src/main/java/com/github/philippefichet/OneEntity.java, especially line 17 between "Str" and "ing();". Compare the Gradle and Maven behavior using the supplied JFR and animated screenshots; done means identifying and addressing the Gradle-specific delay while preserving fast Maven behavior.

Written by the indexing model from the issue text.