[patch] Remove Junit 4 last remains

[gaben]

While working on some patches, I noticed that IntelliJ still has ancient Junit4 files on the classpath. I therefore started removing them completely from the core.

I only focused on the core, the core plugins still have to be checked.

FYI: There is an existing ticket for Junit 6 migration (#24921).

[gaben]

Also #23090 should be fixed with the changes.

[gaben]

Beware, the patch introduces deprecations, but it should ultimately be leaner and cleaner for everyone in the long term.

Some adjustments will probably be needed.

Changes:

• removed all references to JUnit 4 (dropped junit-vintage-engine, junit-jupiter-migrationsupport), JOSMTestRules now runs on plain Jupiter callbacks
• build cleanup:
  • removed the unused commonslang/errorprone_javac ivy confs and the javacc.home property,
  • fixed the jdeps "all" graph and standalone ant extract-libraries, and
  • synced commons-lang3 between Ant and Maven.
• josm-custom.jar no longer bundles commons-lang3 and Jetbrains annotations; the sources jar now ships jakarta.annotation-api 3.0.0 sources, matching the classes.
• tests no longer write foobar/ or failed.png into the working copy (#23090)
• PluginHandlerJOSMTooOldTest no longer fails on my machine with hu_HU locale. The expected strings were built before the test switched the locale to English, so they had the wrong thousands separator.

[gaben]

If there are no comments regarding the patch, I'll apply the fixes in the next few days (at the start of the next release cycle).

This will be alongside other build-related fixes that I have been moving back and forth on my machine for a while.

[stoecker]

Milestone renamed

[gaben]

In 36522/osm:

see #24924 - use the JUnit 5+ assertThrows in photo_geotagging and remove org.junit.vintage dependency

[gaben]

Please merge: ​https://github.com/JOSM/markseen/pull/8

Removing JUnit 4 from the core would break the markseen plugin's tests. Fortunately, this does not seem to affect the tests of other plugins, including those hosted on GH. This is either because they declare their own dependencies, or because they do not use functions that are soon to be removed.