Allow selecting JavaSE-25 from the environments list for debugging

[iloveeclipse]

Fixes #744

[iloveeclipse]

This will fail compilation, it requires new IBuild with the used constant introduced in eclipse-jdt/eclipse.jdt.core#4259

[trancexpress]

Sorry, I must have missed something from the previous PR.

[iloveeclipse]

Sorry, I must have missed something from the previous PR.

Not only you, Alex too in his original change :-)

[akurtakov]

The process of adding new Java version is very convoluted and involves way too many places . My plan was to removing the need to edit manually in leaves (like in eclipse-jdt/eclipse.jdt.ui#1966 ) and use experience gathered from doing so for trying to automate more in other places (e.g. BREEs) . The stars laughed at my plans and decided smth totally different for me now so that battle would be for someone else.

[iloveeclipse]

With https://download.eclipse.org/eclipse/downloads/drops4/I20250728-1800 the build is successful (except warnings below).
Reported "new" warnings are neither new nor related:

• JavaConnectTab extends non-API type AbstractJavaMainTab
• The API problem filter for: 'RuntimeClasspathViewer illegally extends TableViewer' is no longer used

Meging.