Remove internal ICU support from databinding API

[vogella]

The public ICU-based databinding API was removed in 2022 (commit 616243f). This change removes the remaining internal reflective fallbacks to com.ibm.icu.text.NumberFormat and com.ibm.icu.math.BigDecimal in org.eclipse.core.databinding, completing the transition to java.text. Java 17 (the bundle's BREE) handles BigDecimal parsing/formatting correctly via DecimalFormat#setParseBigDecimal(true), which is already used. Also drops two stale Javadoc references that contrasted these classes with sibling classes that no longer exist.

Planned for 4.41.

[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:

bundles/org.eclipse.core.databinding/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 317d53a26bd3c0051f3616a4e8e67fb68e1a5c71 Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <platform-bot@eclipse.org>
Date: Thu, 7 May 2026 23:36:32 +0000
Subject: [PATCH] Version bump(s) for 4.40 stream


diff --git a/bundles/org.eclipse.core.databinding/META-INF/MANIFEST.MF b/bundles/org.eclipse.core.databinding/META-INF/MANIFEST.MF
index 12009435d8..da03b94e72 100644
--- a/bundles/org.eclipse.core.databinding/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.core.databinding/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.core.databinding
-Bundle-Version: 1.13.700.qualifier
+Bundle-Version: 1.13.800.qualifier
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
 Export-Package: org.eclipse.core.databinding;version="1.0.0",
-- 
2.53.0

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

[github-actions]

Test Results

   858 files  ±0     858 suites  ±0   52m 54s ⏱️ - 1m 33s
 7 977 tests ±0   7 734 ✅ ±0  243 💤 ±0  0 ❌ ±0 
20 433 runs  ±0  19 778 ✅ ±0  655 💤 ±0  0 ❌ ±0 

Results for commit 3efb1b0. ± Comparison against base commit a2d8374.

♻️ This comment has been updated with latest results.