improve JDK 25 AOT cache usage

[martinlippert]

As mentioned in #1774 (comment), we need to look into the AOT usage and output to see what can be done to further improve the AOT cache usage and reduce the number of classes that can't be cached.

For now, it looks like some JAR file signing of the Eclipse JARs prevent the Leyden AOT cache implementation from caching data for those classes, so we might need to remove the signatures (as a first idea).

[martinlippert]

Turning on detailed Leyden AOT logging, I can see lots of messages like:

[warning][aot] Skipping org/eclipse/jdt/core/dom/PackageDeclaration: Signed JAR

We can solve this by removing the signatures from the Eclipse JAR files in the packaged boot.ls bundle.

[martinlippert]

Next suspicious log from Leyden, I see quite a bunch of those:

[warning][aot] Skipping jdk/proxy2/$Proxy42: Unsupported location

[martinlippert]

Removing the signatures is all that I can think of around this at the moment, therefore closing this as done.