Migrate from SubProgressMonitor to SubMonitor

[vogella]

This commit migrates the codebase from the deprecated SubProgressMonitor (deprecated since Eclipse 4.6 Neon) to SubMonitor as per Eclipse API recommendations.

Changes:

• Updated Progress.java utility class to use SubMonitor.convert() and split() methods instead of SubProgressMonitor
• Migrated EditorUtility.java to use SubMonitor pattern directly, removing the getSubProgressMonitor method and unused imports
• Migrated CompilationUnitDocumentProvider.java to use SubMonitor pattern in commitWorkingCopy and notifyPostSaveListeners methods
• Removed calls to monitor.done() and subMonitor.done() where not needed (SubMonitor handles cleanup automatically in most cases)
• Updated PREPEND_MAIN_LABEL_TO_SUBTASK usage to use plain split() as there is no direct replacement; clients should use fully- formatted task labels instead

The migration follows the official Eclipse migration guide:

• Replaced IProgressMonitor.beginTask() with SubMonitor.convert()
• Replaced new SubProgressMonitor(monitor, ticks) with split(ticks)
• Replaced SUPPRESS_SUBTASK_LABEL flag with SubMonitor.SUPPRESS_SUBTASK

What it does

How to test

Author checklist

• I have thoroughly tested my changes
• The change is following the coding conventions
• I have signed the Eclipse Contributor Agreement (ECA)

[vogella]

I will split the changes in org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/wizards/NewTypeWizardPage.java out of this

[eclipse-jdt-bot]

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

org.eclipse.jdt.ui/META-INF/MANIFEST.MF
org.eclipse.jdt.ui/pom.xml

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 296d7c2edd1f74363ca234d999b70ca4aa0c86c3 Mon Sep 17 00:00:00 2001
From: Eclipse JDT Bot <jdt-bot@eclipse.org>
Date: Sat, 30 May 2026 08:59:15 +0000
Subject: [PATCH] Version bump(s) for 4.41 stream


diff --git a/org.eclipse.jdt.ui/META-INF/MANIFEST.MF b/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
index 46e1d14032..5458e46b76 100644
--- a/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
+++ b/org.eclipse.jdt.ui/META-INF/MANIFEST.MF
@@ -3,7 +3,7 @@ Automatic-Module-Name: org.eclipse.jdt.ui
 Bundle-ManifestVersion: 2
 Bundle-Name: %pluginName
 Bundle-SymbolicName: org.eclipse.jdt.ui; singleton:=true
-Bundle-Version: 3.38.0.qualifier
+Bundle-Version: 3.38.100.qualifier
 Bundle-Activator: org.eclipse.jdt.internal.ui.JavaPlugin
 Bundle-ActivationPolicy: lazy
 Bundle-Vendor: %providerName
diff --git a/org.eclipse.jdt.ui/pom.xml b/org.eclipse.jdt.ui/pom.xml
index a4e99280bd..9292a7ccb3 100644
--- a/org.eclipse.jdt.ui/pom.xml
+++ b/org.eclipse.jdt.ui/pom.xml
@@ -18,7 +18,7 @@
   </parent>
   <groupId>org.eclipse.jdt</groupId>
   <artifactId>org.eclipse.jdt.ui</artifactId>
-  <version>3.38.0-SNAPSHOT</version>
+  <version>3.38.100-SNAPSHOT</version>
   <packaging>eclipse-plugin</packaging>
 
 	<build>
-- 
2.54.0

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