make artemis concurrency errors in tests less likely by not submittin…

…g the cleared assessment

src/test/java/edu/kit/kastel/sdq/artemis4j/End2EndTest.java

@@ -67,17 +67,11 @@ public void setup() throws ArtemisClientException, IOException {
 
         // ensure that the submission is locked
         this.assessment = this.programmingSubmission.tryLock(this.gradingConfig).orElseThrow();
-        this.cleanupFeedback();
-        this.assessment = this.programmingSubmission.tryLock(this.gradingConfig).orElseThrow();
+        this.assessment.clearAnnotations();
 
         Assertions.assertTrue(this.assessment.getAnnotations().isEmpty());
     }
 
-    private void cleanupFeedback() throws ArtemisClientException {
-        this.assessment.clearAnnotations();
-        this.assessment.submit();
-    }
-
     @Test
     void testCreationOfSimpleAnnotations() throws ArtemisClientException {
         MistakeType mistakeType = this.gradingConfig.getMistakeTypes().get(1);