Simplify SymLink creation in eclipse.core.tests

[HannesWell]

As discussed in #755 (comment).

[github-actions]

Test Results

 1 683 files   1 683 suites   1h 27m 18s ⏱️
 4 228 tests  4 197 ✅  24 💤  7 ❌
12 684 runs  12 500 ✅ 167 💤 17 ❌

For more details on these failures, see this check.

Results for commit ffc2cb7.

♻️ This comment has been updated with latest results.

[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.tests.harness/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 fbba2c77376396ea967445cb2a7dddb4326d396d Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <[email protected]>
Date: Fri, 6 Jun 2025 08:59:56 +0000
Subject: [PATCH] Version bump(s) for 4.37 stream


diff --git a/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF b/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
index 960ca86689..73c195feab 100644
--- a/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
+++ b/runtime/tests/org.eclipse.core.tests.harness/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: Eclipse Core Tests Harness
 Bundle-SymbolicName: org.eclipse.core.tests.harness;singleton:=true
-Bundle-Version: 3.17.200.qualifier
+Bundle-Version: 3.17.300.qualifier
 Bundle-Vendor: Eclipse.org
 Export-Package: org.eclipse.core.tests.harness;version="2.0",
  org.eclipse.core.tests.harness.session,
-- 
2.49.0

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