[mac] PluginsNotLoadedTest fails I20241217-1800

Both mac builds:
https://download.eclipse.org/eclipse/downloads/drops4/I20241217-1800/testresults/html/org.eclipse.jdt.text.tests_ep435I-unit-macosx-x86_64-java17_macosx.cocoa.x86_64_17.html
https://download.eclipse.org/eclipse/downloads/drops4/I20241217-1800/testresults/html/org.eclipse.jdt.text.tests_ep435I-unit-macosx-aarch64-java17_macosx.cocoa.aarch64_17.html
```
Wrong bundles loaded: - org.eclipse.jdt.junit expected:<0> but was:<24>

java.lang.AssertionError: Wrong bundles loaded:
- org.eclipse.jdt.junit
expected:<0> but was:<24>
at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.failNotEquals(Assert.java:835)
at org.junit.Assert.assertEquals(Assert.java:647)
at org.eclipse.jdt.text.tests.PluginsNotLoadedTest.pluginsNotLoaded(PluginsNotLoadedTest.java:278)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
```

Start by running or inspecting PluginsNotLoadedTest.pluginsNotLoaded at PluginsNotLoadedTest.java:278 and compare the two linked macOS test reports. Trace why org.eclipse.jdt.junit is loaded when the test expects none, and consider the issue done when the test passes on both macOS builds.

Written by the indexing model from the issue text.