Re-Enable `testFormatOnReadOnlyFileAndMakeWritable` for Ubuntu-24.04

[FlorianKroiss]

The test has been failing for a while. We should look into the error and fix it.
The test was disabled in the meantime to make the CI pass again

Error from Test Execution

  org.eclipse.lsp4e.test.format.FormatHandlerReadOnlyTest.testFormatOnReadOnlyFileAndMakeWritable -- Time elapsed: 5.163 s <<< FAILURE!
  org.opentest4j.AssertionFailedError: Condition not met within expected time. ==> expected: <true> but was: <false>
  	at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
  	at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
  	at org.junit.jupiter.api.AssertTrue.failNotTrue(AssertTrue.java:63)
  	at org.junit.jupiter.api.AssertTrue.assertTrue(AssertTrue.java:36)
  	at org.junit.jupiter.api.Assertions.assertTrue(Assertions.java:214)
  	at org.eclipse.lsp4e.test.utils.TestUtils.waitForAndAssertCondition(TestUtils.java:369)
  	at org.eclipse.lsp4e.test.utils.TestUtils.waitForAndAssertCondition(TestUtils.java:340)
  	at org.eclipse.lsp4e.test.utils.TestUtils.waitForAndAssertCondition(TestUtils.java:332)
  	at org.eclipse.lsp4e.test.format.FormatHandlerReadOnlyTest.testFormatOnReadOnlyFileAndMakeWritable(FormatHandlerReadOnlyTest.java:110)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
  	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
  	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)