CleanUpStressTest.testAllCleanUps fails since I20250129-1800

[jukzi]

Content not as expected for junit.runner.BaseTestRunner.java expected:<... package for")) { //[ ]$NON-NLS-1$ ...> but was:<... package for")) { //[]$NON-NLS-1$ ...>

org.junit.ComparisonFailure: Content not as expected for junit.runner.BaseTestRunner.java expected:<... package for")) { //[ ]$NON-NLS-1$
...> but was:<... package for")) { //[]$NON-NLS-1$
...>
at org.junit.Assert.assertEquals(Assert.java:117)
at org.eclipse.jdt.ui.tests.quickfix.CleanUpStressTest.testAllCleanUps(CleanUpStressTest.java:5359)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)

for example
https://download.eclipse.org/eclipse/downloads/drops4/I20250129-1800/testresults/html/org.eclipse.jdt.ui.tests_ep435I-unit-linux-x86_64-java21_linux.gtk.x86_64_21.html

[jukzi]

caused by eclipse-jdt/eclipse.jdt.core#3631 @jjohnstn
maybe intentional?

[jukzi]

[jjohnstn]

@jukzi I'll look at it.

[jjohnstn]

I think that the test should never have added a space within a new NLS marker so I am posting a PR to change it. If my code fixed that, great.