Replace com.ibm.icu dependency with org.eclipse.ant.core in expression

[vogella]

tests

The ExpressionTestsPluginUnloading test was using com.ibm.icu bundle for testing plugin loading/unloading and classloader isolation. This change replaces it with org.eclipse.ant.core bundle to support removal of com.ibm.icu from the platform.

Changes:

• Replace fake com.ibm.icu.text.DecimalFormat with org.eclipse.ant.core.AntRunner
• Update test to use org.eclipse.ant.core bundle instead of com.ibm.icu
• Adjust instanceof checks to match new bundle's class interfaces
• org.eclipse.ant.core is a suitable replacement as it can be safely stopped/restarted without affecting test execution

[github-actions]

Test Results

 1 953 files  ±0   1 953 suites  ±0   1h 26m 5s ⏱️ - 2m 11s
 4 744 tests ±0   4 720 ✅ ±0   24 💤 ±0  0 ❌ ±0 
14 232 runs  ±0  14 050 ✅ ±0  182 💤 ±0  0 ❌ ±0 

Results for commit ec3ef48. ± Comparison against base commit ad08006.

♻️ This comment has been updated with latest results.

[merks]

Of course I have nothing again this change to a test.

There are some actual uses outside of test:

[akurtakov]

@vogella Would you please take care of the ECA failure?

[eclipse-platform-bot]

This pull request changes some projects for the first time in this development cycle.
Therefore the following files need a version increment:

runtime/tests/org.eclipse.core.expressions.tests/META-INF/MANIFEST.MF

An additional commit containing all the necessary changes was pushed to the top of this PR's branch. To obtain these changes (for example if you want to push more changes) either fetch from your fork or apply the git patch.

Git patch

From bf7bf5cc646094428f52e3c31b5e142401ea3351 Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <platform-bot@eclipse.org>
Date: Fri, 12 Dec 2025 06:38:54 +0000
Subject: [PATCH] Version bump(s) for 4.39 stream


diff --git a/runtime/tests/org.eclipse.core.expressions.tests/META-INF/MANIFEST.MF b/runtime/tests/org.eclipse.core.expressions.tests/META-INF/MANIFEST.MF
index 1c9eae3130..7d71ae59d1 100644
--- a/runtime/tests/org.eclipse.core.expressions.tests/META-INF/MANIFEST.MF
+++ b/runtime/tests/org.eclipse.core.expressions.tests/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.core.expressions.tests; singleton:=true
-Bundle-Version: 3.7.600.qualifier
+Bundle-Version: 3.7.700.qualifier
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
 Export-Package: 
-- 
2.52.0

Further information are available in Common Build Issues - Missing version increments.