Obsolete endorsed.classpath added in Java web projects while opening projects

### Apache NetBeans version

Apache NetBeans 23

### What happened

Extension mechanism and endorsed classpath are not supported since Java 9 (see https://bugs.openjdk.org/browse/JDK-8065702)
This introduces javax classes namespace when using jakarta ee 9+ and break compile or execution
HTTPS and NG Test support broken (sometimes).
Code generation with wsimport broken.
Certainly other problems not detected.
Makes no sense in Java 9+ projects.

### Language / Project Type / NetBeans Component

Java ant web project

### How to reproduce

Create a Java ant web project.
Exit and restart Netbeans.

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

No / Don't know

### Operating System

Windows 11

### JDK

JDK 21

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

The issue exists since namespace change (javax -> jakarta)
Our workaround consists in emptying endorsed.classpath with an ant script in all projects and removing jars from nblibraries.properties

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

No

Start by inspecting how Java ant web projects are created and reopened on JDK 21, focusing on endorsed.classpath and nblibraries.properties. Reproduce the issue with a new project, then verify that Java 9+ projects no longer receive the obsolete endorsed classpath and that Jakarta-based compilation and execution are not broken.

Written by the indexing model from the issue text.