Remove sun.misc.Unsafe memory access API usage

- JDK 24 logs warnings to console on misc.Unsafe mem access API use,
- "JDK 26 or later" will set `--sun-misc-unsafe-memory-access` to `deny`
- last phase removes the methods

see [JEP 498](https://openjdk.org/jeps/498).

nb 25 started on JDK 24 in terminal will print the following to console:
```
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper (jar:file:/home/mbien/dev/nb/java/maven/lib/guava-33.2.1-jre.jar!/)
WARNING: Please consider reporting this to the maintainers of class com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
```
to get the full stack trace, set `--sun-misc-unsafe-memory-access=debug`

(but there might be more usages, guava might have it fixed in the next release https://github.com/google/guava/issues/6806#issuecomment-2590312869) edit: guava and guice is resolved

No NetBeans source files or tests are named. Start by searching the NetBeans sources and bundled dependencies for sun.misc.Unsafe memory-access calls, then run NetBeans on JDK 24 with --sun-misc-unsafe-memory-access=debug; done means the remaining usage is removed or replaced and the warnings no longer occur.

Written by the indexing model from the issue text.